The post is a broad, and IMO, valid criticism. Though I'm not sure having a different protocol is a _huge_ problem. If Gemini ever got popular both backends and clients would add support.

I think the real issue, and the OP touches on it, is the text/gemini format. There's a ton of content that would enrich Gemini (and that fits Gemini's mission) but that simply isn't usable in text/gemini. Specifically, I'm talking about inline-links (though that isn't the only issue).

I wrote a server in elixir, and tried to convert Wikiversity's Introduction to Programming (1) both manually and automatically. I found the output unusable and couldn't come up with a case where I'd ever prefer/recommend it.

(1) https://en.wikiversity.org/wiki/Introduction_to_Programming