What about compared to PoE in the first week it came out? D4 will get better as they iterate on it based on gameplay and feedback just like they did with D3 and D2.
I'm sure they will expand on gameplay but there's no indication they'll come close to scratching the surface of PoE's depth, and I don't think they're trying to. D4 is supposed to be a simpler game with a lower barrier to entry that is more accommodating to casual players. You can't get a whole lot out of PoE as a beginner without third-party resources, there's certainly a tradeoff to its many layers of complexity.
D3 and D4 are games made for people in their 30s who grew up playing D1 and D2 and now only have a couple of hours a day to play, and that's fine