Completely depends how they do it.
Look at sod for example, it was mostly a copy of ascensions rune system but it was just worse. Now ascension made their own sod and it’s significantly better
I think most people tend to agree on the basics of what classic+ should be. Universally everyone wants new content, stuff added and changed in world, new raids new pvp stuff etc
What no one can seem to agree on is how classes will be designed. There’s multiple servers out now that use different xpacs talent trees. Personally idc and just want the damage values to make sense.
But I don’t think even the classic developers know how to make the game good. And personally if they rebalance classes and give meme specs the treatment then I wouldn’t want the game to be too easy. If you increase player power then you gotta make the game scaled up to compensate
I gotta say tho I don’t think you’ll see a mythic raiding in classic+, blizzard even the retail lead are trying to dumb down retail csuse it’s “too hard”, so they’ll do what gets them the most players first