Arguably D4 is definitely better than D3, it returns a lot of the stylistic choices that was missing from D3. And it incorporates a lot of the better mechanics from D3. But it is not the true successor to D2.

I feel like I might need to play this again to truly cement my thoughts on this, but I know that it lacks something that is really integral to Diablo as a whole.

Oh and fuck the shitty live service shit, only online nonsense and the awful battlepass/microtransactions crap. Leave that shit for the terrible free to play crap that gets shoveled out year after year and stop putting it in singleplayer/co-op games.