As strange as it may sound? Not everyone has played Diablo 2. So a remaster has a chance at a classic game garnering new players. So while I and many others want it to be more in line with the classic game we love? There are benefits to introducing some changes.
Games evolve over time. Even a remaster presents an opportunity to address some pain points of the original. Look at some other remasters that have come out on console. Windwaker HD added the swift sail to remove some of the tedium in sailing for the triforce shard quest.
Skyward Sword HD coming out for Switch is adding more traditional controls which stands to allow the game to reach people that were turned off by motion controls. (Which are still an option).
Yes Diablo 4 is coming and I feel it’s there where more sweeping changes will be seen. I think that Ressurected can walk and chew gum at the same time. The updated resolution, Cross progression, and expanded statsh are all positive changes. I don’t think they should go mucking about with talents or anything naturally and I don’t think they will. But I feel there are areas where they could opt for some small tweaks here or there.
Things like Micro says above for instance. Toggles for various things are usually a positive.