Because it opens up anyone who has a blog to turn it into their own self-hosting instance
> Every mastodon install is already an “independent hostable platform,” right? So when you say that, you must mean Wordpress. So I’m sincerely asking, why is it important that Wordpress federate comments? What problem is that solving? And who has that problem?Think about the fact that you are potentially opening up your blog discussion to a community of millions of users, whose comments remain on your site
But I would like to ask you why you get so angry? If the activitypub plugin were mandatory, I would also express my doubts, but the adoption of the plugin is free and no one forces you to install it. Personally I find that Matthias' plugin is the perfect evolution of the Wordpress comment system, a system that barely survived the blog era and which now showed obvious interoperability limits.
Today, however, with this plugin, beautiful perspectives open up. Indeed, the integration between link aggregators like Lemmy and the most widespread open source software for blog creation is about to create the real evolutionary leap of the Fediverse: the #bloggingverse
If you want though, you can continue to use it as it was before, you are totally free to do so