I don't think people are pushing ActivityPub as a silver bullet, so much as they're using it as "the currently-available and less-awful alternative to closed silos". If someone is starving, they're not going to hold out for a gourmet cheesecake that's a year away from being made. They'll happily take an immediately-available baked potato instead.
People are pushing AP as a silver bullet. Look at this thread! Twitter is funding work to be done in more than an year and people are saying that should just use AP.
I disagree. I think most of the people in this thread are promoting Activitypub merely as a starting point. Sure, it could use some tweaks and improvements, but it's a good foundation to build on.
Your previous comment came closer to the truth: ActivityPub may work today _as a workaround_, a half-baked alternative to closed silos; but it doesn't have a solid foundation, its problems can't be solved by tweaks and improvements, and that's what every of its critics say.
