Because Bloodborne is one of my favourite games of all time made by my favourite dev and if this remaster is true it will likely be the only way I'm ever getting to play it at 60fps (or more) and high res. And outside of enhanced resolution, framerate and faster loading I want it to stay as true to the original as possible unless FROM and Miyazaki actually go back and make additional content.
I don't want some other team to come in and start changing the way it looks and feels or putting in new areas and bosses that aren't up to par with the rest of the game (unless all the added content is strictly optional).
Same way I wouldn't want a 4K Blu-ray release of my favourite movie to have some other writers and director come in and start changing the editing, adding new scenes, altering the art direction, etc.
Also, the game runs at 30fps with well documented framepscing issues. It might not bother you personally, which is fine, but the overall performance being less than ideal isn't really something that is up to debate