I find both solutions to be flawed. The traditional scrollbar introduces layout shift when going from one page without a scrollbar to a page with a scrollbar. The new overlay scrollbar is sometimes harder to click and activate, especially in Chromium. Firefox's overlay scrollbar seems to do the right thing. The reading progress bars are a distraction and probably harmful to one's attention span and reading ability.
I guess scrollbar-gutter can fix the traditional scrollbar but then people have to give up using their fancy banners in headers. I'm (mostly) fine with Firefox's overlay scrollbar for now.
I guess scrollbar-gutter can fix the traditional scrollbar but then people have to give up using their fancy banners in headers. I'm (mostly) fine with Firefox's overlay scrollbar for now.