The current situation with pinned topics is really annoying, and it needs some work. Most likely, new users (including us active people) scrolled to the bottom of a pinned topic before discovering the interface settings. Because of this, pinned topics cannot be shown pinned again for the user, even when the setting is on to not unpin topics. To fix this, there should instead be a setting to toggle/untoggle pinned topics showing at the top of a page. To help new users alot more, this setting should be on as default.
This would be an extremely simple but amazing change.