Suggesting improvements is ok. Recommending complete rewrite in different stack and technologies is not constructive critique imo.
> If it ain't broke don't fix it? Or is there some specific shortcomming that might justify a rewrite?
I’m answering that question. The information is out there, so if people want to ignore it that’s beyond my mandate. But this is still constructive since someone out there wanting to rewrite Gitea will want to know what the pain points are before they do so.