While I agree that the black triangle is annoyingly small, I really don't want the behaviour of the "Read more..." (or whatever cut text the poster has put there) link to be changed. It does serve a useful purpose to be able to jump directly to the cut, which can be important in long posts, or posts with spoilers that one wishes to skip, or posts that have a lot of drabbles in different fandoms and you're only interested in some of them. Cuts really have a dual purpose: the main purpose is to cut content from the reading page, but they can also be used as a table-of-contents, organising the post. So they are useful and I don't want to lose them.

Well, I don't want to lose them, unless they are replaced by something equivalent, such as an actual table-of-contents for a post.