I think the author brings some interesting points, but ultimately I think it's a faulty premise.

The fediverse is whatever the user wants it to be. That's the whole point really. If you want a reliable communications platform with zero dropped messages, aka email 2.0, then you can definitely build that on the fediverse and people can join such a platform if that's what they want.

If that's not what you want... Well then don't join such a platform. Join another one. You do you.

We don't need anyone telling us how to communicate or consume content or whatever we want to do with the fediverse. The whole point of the fediverse is that everyone gets to decide for themselves, so there's no need to be prescriptive about any one approach.