[kixiQu]

The warning is necessary, so I'm not disagreeing with you per se... But I think it's a positive quality of the piece that it doesn't actually resolve to a thesis about the comparison (as might "email is fine, and therefore..."), but just points out the tension. It's up to the reader to use the comparison to take a moment to consider what they think the costs and benefits involved are. Plenty of folks (well, judging from comments sections) think that email fails at many of the things it claims to do, and would assent to an "Everyone sucks here" judgment about both email and the Fediverse.