Aside from the usability learning curve he talks about, the other very pointed criticism is scalability problems that instance owners face. From what I understand, Lemmy and Mastodon are both similar in that they use the ActivityPub protocol. Could Lemmy get too big to scale and still be decentralized?
For his argument, length of use doesn’t matter. He’s more concerned with the new user experience, which can be determined on the order of days.
His criticisms are valid. Getting started on the Fediverse sucks. Let’s accept the criticism and get on fixing it