First of all, great to see the new options to customize Theme fonts and color options, all though a little change, it makes a huge difference to the perceived value from the perspective of the end user.

However, what seems very much out if sync is, that Theme fonts are not supported for Page elements?

Meaning, you can build an application with Barlow as Theme font, but you have no way of using Barlow as the font for i.e. buttons on Pages? This seems like something that really should be a quick fix.