I don't know if you guys are regurgitating what other people have told you but unless you're trying to push leaderboards (which are pointless anyways) pretty much every build is within 5-10 GR levels of eachother. Even then DH has 4 different builds in the top 5 leaderboards spots right now. Barb has IK HotA and Raekors HotA plus 2 different support builds that can push top tier. Necro has like 5 different builds that are all top tier. I don't play much wiz but there are like 4-5 builds that are all top/high tier and wiz is the fastest T13 in the game on top of that. Monk is the most wanted support in the game plus has a few high tier pushing builds. WD is probably the only class hurting but that's only if you compare yourself to other classes. WD is the strongest its ever been with the most options.
Then every class has numerous speed builds, all of which are pretty damn fast.
But no one is forcing you to play any build. There are new builds being discovered pretty often. The fastest and most powerful necro speed is pretty damn new.
I mean all of that is like... your opinion man...
I like D3 for what it is. A very smooth hack and slash that I can pick up and play whenever I want and drop for however long while I play other things. Its simple. It feels good. You can create obvious goals for yourself. As I listed above there are a TON of builds to try out. You can put thousands of hours into it pretty easily.
I don't like PoE. It feels clunky. Its overwhelming. The character creation is limited so you don't feel the RPG elements in ARPG (Not that D3 has had much of this either but at least you can choose gender). On top of that I play somewhat casually and PoE does not jive with that. I've tried to like PoE. Many many times. I just can't.
They're two different games and neither needs to try to be the other.