I mean, fuck, this sites slogan is "doesn't scale to your level" and I get it. I prefer a goblin to be a goblin forever and to fight harder monsters rather than scaled monsters as the game progresses.
But, at the same time, It wouldn't break the lore to leave Candlekeep in Baldurs Gate and walk straight into a Red Dragon. Is it just luck that in RPGs you always run into enemies appropriate to your level? All BG1 and you never run into any level 20 monsters yet wander down to Amn and suddenly you'll never find a level 1?
Like, it's just a game. You just suspend disbelief. Ian McKellen plays a wizard in LOTR but do you think he goes home and shoots lightning bolts into his boyfriends asshole? Just accept the fantasy. Focus on the story and the sound and graphics and just enjoy the ride without picking it to bits. There's plenty of immersion if you allow it.
Power leveling is fun but you'd have to agree it's breaking the game. I beat BG with a solo character because, for some reason, you get 6 times more XP when you don't have to share it around. But if you think about the roleplay, how does that make any sense? Surely there would be more experience to be had from working as a team and establishing some party coordination and tactics?
I don't think there's really any downside. In games there's sort of no wrong answers, lots of ways to do the same things. PoE removing gold and using ID scrolls and stuff for money is perfectly valid but there's nothing inherently wrong with good old gold, either.
If you make act 1 of 5 exclusively for level 1 to 20 then at end game you end up with only 20% of the content. I think its better to keep it open and let people do any of the 140 dungeons in the whole game rather than just the 25 in act 5. It's easy to see the reasoning behind the decisions made for D4.
At the end of the day, you can play whatever you want. If you're still having fun with PoE or something then that's awesome and you should keep playing. But I've played everything and I'm bored of everything and can't wait to play more D4 because it's a new game with its own take on things and it all seems to work really well for the type of game it is.