No, according to the post I shared, you can do more than that:

> You can also recolor any part of a widget however you like

And they show an example of a gradient background and stuff like that.

And I mean, for most people, a theme is just coloring things how they like and setting the font and visual things. While full-blown stylesheets are very cool, and I think still “allowed,” you can’t really officially support that in a compatible way. You have to set an API so that everything can be consistent.

For example, it can currently be a huge pain to change the accent color on PopOS away from orange because you can’t just set a variable somewhere. It seems like the new system will improve that.

Either way, leaps and bounds ahead of macOS

I'm going to be real with you, if your definition of 'theming' is setting an accent color and choosing between light and dark mode... I think I feel really bad for you.