Regarding nerfing - nobody likes to have a build or an item they invested a lot of time into acquiring and setting up to be nerfed. To start up and find your character weaker than the day before is definitely an un-fun result.
Regarding glass cannons - in most of the article the OP advocates choice and viability of different builds. There are people like me who enjoy running glass cannons and not building for survivability…best defense is a good offense. Let the game be designed to allow different play styles to be viable, including glass cannon.
POE currency and trading - not a panacea. I love POE. I would love it a lot more if trading was less cumbersome and currency a little less complicated. D4 doesn’t need to be another POE.
Speaking of currency, please don’t make dozens of different currencies with very limited uses. Seems like in many MMOs they use that to fill up inventory space to force players to buy additions to. It seems like that’s also used to channel players’ activities grinding different currencies. Another un-fun game mechanic in my view.