Why do that lol, the rolls are low anyway, what do you get 35% Overpower damage or 30-40 main stat ? 
The big jump on gear between 50 and 60 (like from IP 560 to 750 and even 800 later) makes it even less worthy of doing that
As mentioned (perhaps not this thread but the other), time sink is the Seasonal pass (I did 15 apparition events and still not cleared Chapter 1 for ex.)
And yes, one more thing is a time-sinker IMO - glyph leveling (more on that down below)
The initial itemization wasn’t that bad… I mean it was but they fixed reworked for the wrong reasons… All that D4 really had to do is well first of all optimize the affixes cause there was too much redundance, but then also make all item slots vary in the inherent roll (i.e. every “static” piece of gear to behave more like the Pants for example)
Knight’s staff (+x to skills of type) or King’s staff (+x to all skills), or Warrior’s staff (+% vs elites or casters or flyers for ex.), Marauder’s staff (+% vs CC-ed), Wanderer’s staff (+x% LH), Sorceror’s staff (+x% RCR or CDR)
Do same/similar for all other slots (or at least a few like say Amulet) and you’re OK to go
And yes, Tempering would’ve worked well as an upgrade (like make a certain % of items Temperable) and wouldn’t have had to carry the entire weight of the non-Unique items
The downside is perhaps if there’s something you already like on gear, chances are you’ll get less of what you want, but the upsides are just superb and hard to ignore I think
Like first of all fixes the largest problem of gear back at the time where you don’t have to GAMBLE on rerolls for long sessions if what you’re looking for (for ex. MS on Amulet) can also be an Inherent/Implicit roll (albeit even rare) on an item IMO
My “big” problem with D4 is the “time sink requirement” (the continuation from above), i.e. that phase where I’m “in between” torment tiers where I can’t do anything else but “farm” for GG gear OR advance ~15 levels and in meantime => there’s nothing else… Also the high discrepancy between two torment tiers can mean I just one-shot/level everything or die in 2 hits on the higher one
I’ve said time and time again, just remove the multiplier at lvl46 on Glyphs, cut the leveling down to 50, and then open a Socket (and add another type of Socketables like say “Ornament” for example where you can put it on gear or paragon and depending on a certain stat it gives bonuses - based on total adjacent nodes on Paragon or stats on that gear piece)
The reason is simple why this would work (at least IMO) => there’s no longer a big “time sinker” to upgrade the Glyphs AND I have something to play with and adjust during that phase so my entire game is NOT reduced entirely for hunting a GG item exclusively (I have another layer of min-max to try stuff out)
I’m certain people would see that change as a welcomed one… I know SOME won’t but I’m definitely positive that having that kind of breath of “fresh air” and not knowing upfront every single piece/component and having a bit of “variation” would be a good thing to have
It most certainly is more FUN to swap in and out and experiment here and there a bit (rather than play some long/er hours and “cross fingers” that they’ll get some GG item before you level up those ~15 levels)
This one is “meh”… Sounds good on paper but at the end it’s just more effort sinked in borrowed powers, no ? 
However one very easy thing (that IMO should’ve been done yesterday) is re-add the majority of already existing events and attach a “theme” to them (Horde tunnels for Fire-themed gear, Construct ruin for Lightning-based one, Rootholds for Shadow/Corruption gear, Vampire temple for Cold/Vuln-based, and say Realm of Hate pit or vault for Physical & Overpower)
DONE
Yes, that’s some “recycling” but having events rotate and even appear somewhere you don’t expect (such as Cellars for ex.) and have them be “themed” in terms of “targetted gear/theme” would do this just well enough to reduce the need to recycle seasonal content and stuff all the time (except maybe a new boss or two for those kinds of events)
Certainly not having anything against if they come up with something interesting as a seasonal theme/content, but personally I’d settle for that for quite a while… 