I do like the more modular approach that they took – many services unfortunately go the route of trying to make an “everything app” which often leads to bloat. This is of course not to accuse Gitea, Gitlab, Github, etc. of bloat, I’m just saying, in general, I do understand why they took this approach, and I can certainly appreciate it. I will say that, compared to the usual git services (Gitlab, Github, Gitea, etc.) it is severely lacking polish.
So KDE at the minimum could just have hub + git + lists (for patches), and keep Bugzilla as the single bug tracker, for example.
I personally despise bugzilla. It’s one of my least favorite parts about contributing to KDE. I personally find it very unintuitive, and messy. The UX of the service, on the whole, is not a pleasure.