You thinking that something can't be improved on is not a good reason for it to not happen.
I remember over a decade ago when people were whining about a rumored Silent Hill 2 remake (long before Bloober Team even existed). The argument was as presented here: They shouldn't do a remake because it can't possibly be as good as the original.
You know what I have to say to that? A Silent Hill 2 remake would not erase the original from existence. So who cares? If the remake ends up sucking, go play the original. Simple as.
Funny enough, it's an even more effective thing to do today in regards to Steam games. For example, it's really sending a message about the state of Payday 3 when Payday 2 has several times higher 24 hour concurrent player peaks. It really makes it clear that people wanted more from the franchise and were simply unhappy with the newest product.