The 'some changes are hidden' flow is annoying in some situations. For example: during triage review, status update, or some other meeting where someone is projecting the person driving will often view tickets (why is this one is state foo? Didn't we close this ticket already? Why is that assigned to Bob?) and since they are a responsible-staying-on-top-of-things-team-leader they will almost always have looked at the ticket before and end up with the 'changes are hidden' box. Since they are projecting in front of other people they will also almost always fumble with their mouse and scroll around for a while before managing to click 'show all'.
More general complaints in T6400 but config options make upstream sad while keyboard shortcuts are cool.