I still believe that it'd be easier to add better tooling to the already existing email integration. Nothing is stopping a desktop app to allow users to easily set up git+email and view/comment/preview/apply patches in a clean and easy-to-use interface.

Activitypub just brings so much complexity. Activitypub works best when you're not using it like a website but rather have a dedicated "activitypub" client. Otherwise you'll visit a repo, try to add a pr/issue/etc, it will ask you to sign in to your instance. You'll be redirected, sign in and then see the same repo but on your instance where you can then do the operations. The whole UX is just really confusing.

Any new forge that wishes to partake in this social network also has a massive task ahead of it, because creating an activitypub integration is a lot of work. It's not easy.

Most importantly, people are already signed up to email, so the account signup part is already done too.

What if pull requests are accepted via a Delta Chat channel? Reusing chatmail infrastructure to deliver .patch files essentially.