This really comes down to the intended workflow. By design, SourceHut aims to provide the Linux kernel development model to a wider audience (with extra features beyond mail and Git). It is a very different collaboration model than the likes of GitHub and its peers. I summarize the comparison of the two as "to each their own"; I'm okay with both models and see the merits of both, but my preferences and willingness or ability to work with a given model won't always line up with contributors.

I also self-host Forgejo in my homelab and really enjoy it.