Nobody that worked on D2R was developing Diablo 2 or LoD & Vv studios was not apart of Blizzard, this studio wanted to simply recreate D2/LOD into more modern graphics, they barely changed up much, but the character looks got a downgrade imo
That said, D2R was produced 20 years later using the exact same game, characters, skill, skilltree, monsters, bosses, levels, mercenaries, etc, etc.
From an outside perspective looking in, you can view classic graphics, an exact overlay.
It was only from this point on was there any changes, quality of life improvements, skill balancing, very small set of new runewords, later on terror zones, sundar charms etc, etc.
The whole truth and nothing but the truth: Blizzard Corp is about Pay 2 Win or Pay 2 Play, that's the bottomline right now as it stands, and there's nothing you're going to do to change that from their developer perspective.
The problem with their shareholder board and money over everything dates back about 20 years ago when all the talented creators left the company because this vision was a bad concept for the folks who loved gaming.
D-IV is perfect for Blizzard, very low skill demand to re-engineer a new version of Diablo series, just copy n paste code from D3, take renders from Immortal, look over at Diablo 2 and just ignore it, then release the game!