If I have a criticism of the protocol it is that gemtext errs too far on the side of simplicity, particularly in not allowing inline links or formatting. I would have preferred if it was closer to markdown.

The limited input support doesn't bother me. I don't see the need for social media through Gemini when there are loads of other protocols we can use for that. And even the limited form of input that is supported lets you do a lot if you get creative with it (in fact there are a few social media-like Gemini pages out there).