I think it is the dynamic factor, I prefer 1 function per page. I don’t love dynamically loaded web content. I like old school php forums. For example writing this comment on 4k display makes the writing box window about 1/10th of the page, and crammed to the bottom. It also just seems more suited for mobile than for desktop… which I really do not love mobile first design.
It also seemed like the old “buckets” and topic were more solid. Now it seems like everything is in one “bucket” with tags for topics. So it’s harder to browse in a specific field like just rendering.
It seems like it is more of a shallow / wide design methodology than a deep an narrow / design, and for this functionality deep/narrow design principles are helpful, because I usually come to the forum for specific things, not to browse.
I do like some of the suggestions when typing in a new topic, but over all the look is really distracting and seems to put sleek visuals and a mobile first principle over the ability to find the information you need.
Old forum was Info > Visuals
This forum is Visuals > Info …
My 2 cents.