It would be really nice if the new forum was in a more legible color scheme, or had the option to be. It's great that there's an option to make the text not quite so tiny, for people with more modern/larger screens, but even with cranking the text size up higher than it should need to be, the garish white text is quite painful to try and read on many monitor types. It seems that the forum supports color scheme options since there's a dropdown box in the account preferences, but since there's only one option there, it's meaningful.
Even for the default light on dark, it could easily be refined. Take a look, for example, at the CK3 dev diary that's pinned on top of the new main splash page. It uses a white that if it's not pure #FFFFFF is way too damn close. In stark contrast to this stark contrast, the actual CK3 screenshots show proper UI design wherein an appropriately muted font color has been chosen for pleasant legibility on a variety of screens.