Just upgraded one of my dev sites (using classic) and course page is showing as follows:

1) The condition texts seem too big (compared with boost).

2) The "Mark as done" dimmed elements are really annoying, almost doubling the vertical space needed, although, you know, that's a very-personal opinion.

3) I'm not an activity-completion expert... so if you find any other related thing worth fixing with classic... surely this is the issue to review and fix them.

Ciao