What have they “always” supported exactly? I’ve used GitHub for a long time, but I use it entirely as a git server and sometimes an issue tracker. That said, I’m pretty sure they didn’t support anything that even remotely resembles CI/CD back when I started using it.

I was using GitHub actions to do build, test and push to production for a while now, with the older syntax (the one without yaml). I'm not sure exactly what changed now, and the messaging is indeed confusing