The colors match better because I spent some time customizing them. Apparently I need to take a little more time.
As for xenforo updates - we have skipped several in the past - but it gets more updates simply because users, not only admins & moderators, have more interaction than Wordpress. Everyone makes posts.
Themes are only a one-time charge, as I understand it, but none have looked significantly better to me than customizing the default. And, Xenforo 2.x is a major rewrite, so they simply reassessed everything as they rewrote. The new default theme should look better on mobile, anyways.
EDIT also, "Mark Forums /thread as Read" - It's under "Post Thread" button for the specific forum.
The usual. Clicking on a thread takes you to the first page. No way that I see of getting to the last page from the listing. Also in threads with many pages theres no choice of pages, just first/previous/next/last. Unless Im just not seeing things on mobile...