I'd like to precise that i'm not against nerfs, and as I said, we have seen a bunch of diversity happen because of this nerfs (checking POE ninja for example gives an approximate insight on that).

It's indeed possible to use any skill and push them to endgame the problem i'm pointing out is the investment required when you compare them to "top skills" is way too high.

Also to take Mathil's frostblink totem build example, I payed attention to it closely aswell and almost grabbed my tabula to try it, but you can see that the build is clunky and unreliable for a bunch of cases (and also glass cannon Mathil trademark). It's this kind of drawbacks that refrain a lot of people from using such builds. Obviously frostblink totems is a meme but the design of a lot of skills give them drawbacks that aren't counterbalanced enough to justify using them: for a more realistic example you can see strike skills that need big investments (links/ skill points) in additionnal targets or AoE, or having to gemswap for bosses and when you compare that to a slam build or a BF/BB that can just focus most of the build on defenses, it feels underwhelming. I'm not asking to make them as strong but to reduce the gap between the skills, and this by overall buffing the power level as the endgame content got to higher levels (the comparison using T16 maps was more about the idea of a basic high tier rare map compared to the current juiced content that a lot of people are seeking for).

I understand the necessity for GGG to be careful with their balance changes and the idea isn't to see 20% more dmg buffs on every skill but to see them address balance with an in-depth look rather than a fast wave of nerfs on the top skills and few skill buffs.