I did some thoughts here
Lets say I’d like to get the glitches out of the game. Balancing is a thing of numbers. Since I play almost only monk I can tell you that defense is a really hard thing for monks. We do not have a 60% or 80% dmg reduction ring. So one of the most important: Let us get rid of unity as ring for any monk build. I personally would make desert shroud 80% dr instead of 50 since we have no defensive ring. Then also there needs to be something to make generator builds crowd control immune (since there is no epipany in the build). This is maybe the most squishy build in the whole game. The uliana belt should add stacks to the dmg reduction instead of refreshing - but also then uliana lacks on defense. The defense you need you can read by using swk set with tr: you have 50% set, 50% from epi, 25% from mantle of channeling, then 55% from rcr rolls and crimson (when you do it right) and taeguk gem giving defense. Thats the lowest values you need to be able to survive hardly.
In town I have approx 220 Mio toughness which is barely enough for 130. My season barb has 35 Mio toughness and in fight more toughness than my monk and I play barb the first time. Last season I played my non season WD - the toughness was way better than with my tr monk even if he has very good equipment. So when doing the balance please try to involve defensive buffs as well as dmg buffs and most important the glitches like if you have Flying Dragon equipped in the cube and you play LtK in theory FD should always proc double attack speed → in practise it does not because of lags. I’d be happy if you read my thoughts in the thread since I play monk from beginning (but that thread is pretty old so dmg numbers are outdated)