Hm, I have not found the monks buff but maybe I’m blind.
Since I have no deep knowledge about other classes than monks I can only say somethin about them (and since I started a Vyr Chant I can do some comparison). The problem with monks is more or less that they cannot hold up with other classes, the balance of the sets is pretty okish (can be better of course)
Lets start with collecting builds that are possible:
generator (r6 or as i6r2 with shenlong)
WoL (Inna, LoN, Swk with fnr or with coe / unity)
LtK (Swk or LoN)
Uliana
U4I6
and a build many people want back from vanilla is the gen cyclone build that maybe never comes back again.
Gen is most powerful but unplayable sub 5k paragon (+ map / mob depending as hell) you have no possibility to get nde (since you need 4 passiva), no epi (since you play 0 cdr) so freeze, knockback, etc are hurting as hell. No way it can be a good build to play except you get the all I want is that rift.
WoL, LtK and Uli are pretty close but maybe most people would say WoL is the strongest - but maybe this is because since it is ranged you can do your dmg more often compared to other builds aaaand, ok, uli is a pretty hard to master build.
WoL is pretty easy to equip and relatively easy to play (but most players just do it wrong - many people don’t see that it is a tk build). The thing is, from the start it is a 2H build but 2H builds are not playable since they do not do dmg compared to the 1 handed builds. Mistake number 1. Mistake number 2 is that the set which is giving the most bonus is the worst for the build. that is because you need vangeful wind for set bonus and you need sweeping wind as skill where you can use CS with the other variants and you can use RS to get doubled dmg + perma epi (which is what I want) and it needs def buff like shells or unity. There we have mistake number 3: Monks do not have a def ring or belt (take what you want). Sorc has a 80% reduction ring e.g. Another thing is comparison: when I see my monk doin lets say 3-7 trillions of dmg with each strike (it’s sub 10 and of yourse depending on positioning, zeis procc etc) and my sorc which is bad equipped does 250 trillions of dmg (ok, without coe cold rota its only 80 trio and maybe I’m standing in a circle or whatever) the dmg is just a joke and sorcs also doin a wide range dmg. Sollution? Make it a two handed build again + give us my whished ring / belt (see below)
LtK should be kind of a generator with a spender. It can be a very funny build since you have perma epi (I want that) you can jump all over the map, cs pulls enemys together and striken gives you the dmg. Nice in theory but you simply die! Where are the defense options? Why you need FD in cube, why is there nothin better? Its just rng. So maybe remove the 5-7 monster xtra dmg of scarbringer, give fd a 100% uptime of doubled aps and gimme that ring (see below)
uliana playstyle is kind of unique. In groups its a better tk than a WoL monk (did try it in 120s, both are good but uli has more potential) BUT! there is just NO single target dmg and dmg overall is worse that WoL. EP needs a buff there and there needs to be xtra dmg on elite / bosses etc. Playstyle is fine, as all monk builds it lacks def but its the tankiest build if its a face on. Maybe it relies on unity which is crap.
A sollution for any of the nowadays played builds is the following:
bring in the “ring of ytar”
its leg property is “epi is running all time long and receives all runes”
and redesign fire rune to additional (pls multiplicative) dmg. Give " Desert Shroud" rune more that 50% reduction and bam, buff accepted. It would make
Gen has no fear to be in knockback / freeze anymore + more def + more dmg
WoL / LtK / Uli get more toughness and dmg
then some slight additions on the latter three would make them even with r6 gen monk. you can make you free of unity and maybe orotz is not mandatory anymore.
Its just an idea but it would give a little dmg buff to all monk builds in a pretty even way.
ah and do not forget: a monk is a monk and not a healer. playstyle is not comparable in any way. personally I’d suggest to remove group buffs from monk and barb such that they only give one thing which would make other group members needing more defense. You could e.g. remove inner sanctuary (or its reduction) completely (half). Noone uses it solo. It could e.g. also be doubled sized but half of reduction or so but maybe the healing ability should be left to healers but no additional reduction. I have no idea about barbs but e.g. the cry could be full bonus to him and half to group or so. Some more slight changes should make it equal to have a full support with you or play back to back all DD. All DD I did with my innas WoL monk and we did 123 with it (2 WoL 1 crus 1 dh) or I did 120 in 2 players (with dh and with crus). It can be a real fun to see this workin - but since 2.6.5. its just crap since we can play 3-7 level more if I just select my bad equipped sorc 
Haha I like it… A supp barb ok, but lets say you do not want to be a supp? I would love to see any combination of 4 man matchup in lets say 5 lvl or so. That would be awesome. And just a hint: I have a DH in my list playin 143 with it in a 4 man matchup. Its his highest and he is bk. Try to replace the sorc in meta with any other TK build (e.g. uliana or WoL) and you will fall ~20 levels down. I did 120 with my WoL (and Uli) but thats just the problem. If you replace Necro by a DH it falls about 5 level? In my personal opinion you are in a better spot there. And no, I never played that crappy healer since I hate it! Yeah playin just one class and you are lightyears behind… Maybe I do not have the time to equip more than one class properly. Its not ment offensive but please do not throw monk and healer or barb and supp barb in a pot. I know many barbs and monks out there that wanna have fun with the game and so they refuse to play supp even if they could go higher.
