That's true, but this post is quite specifically about getting Mastodon to follow the blog. Of course you could use more modern alternatives for other platforms

That's true, but this post is quite specifically about getting Mastodon to follow the blog. Of course you could use more modern alternatives for other platforms, but like with other federated protocols, your freedom is often restricted by the most outdated common client implementation. Very few ActivityPub servers are actually spec-compliant, but unless Mastodon loses its leading position, I don't think we'll see spec compliance become relevant soon.