> As people need to review more and more pull requests, time spent scrolling adds up

I can’t believe people would write this as the justification. You can press PgDn on your keyboard a few times or just End once to go to the bottom. If you are on a MacBook and your keyboard doesn’t have these keys, press Fn-Down instead of PgDn and Fn-Right instead of End. When done, use the opposite keys (PgUp/Home/Fn-Up/Fn-Left). I have never once found that scrolling takes too much time.