Do I personally have gripes with the suit? Yes, I don't like all of the lines (especially around the shoulders), would prefer a shorter cape, and all things being equal I would prefer a more traditional symbol and neckline/cape attachment.
However, this sort of manips are pure fantasy and there is no guarantee that they would turn out like you actually want in real life. In particular, as several here have pointed out, Corenswet has a longer neck and that sort of neckline just might not have looked right on him. Similarly, the fit of the suit might have been necessary to allow him natural movement in the suit rather than forcing him to look like a stuffed sausage/posed action figure like Cavill often appeared.
The truth of the matter is that real life fabrics and materials do not always completely behave like how comic book artists draw them. I don't know how many times I have seen seen manips or fanart on the Bat-Boards to change the mouth opening on movie cowls to make them look more like the comics when the truth is those sort of mouth openings just don't work in live action. Where they are placed on the sides of the cheeks is an unstable area that moves a lot when people talk and make expressions with their mouths. They would cause an inevitable amount of weird gaping and other issues.
