Definitely, since https://communitywiki.org/wiki/Gemini explicitly states that Gemini is specified in such a way that it can't easily be extended.
I can understand why the vast Gopher community would immediately dump/mirror all of their content into Gemini Space. My question is why anyone else will, when one can easily create an equally-spartan experience using universal web technologies.
However, as a user, I can't be sure what's behind each URL. Does communitywiki.org require JavaScript? Do they set cookies? Do they violate my privacy with telemetry and analytics?
If I see a gemini:// link, I know the answers to all of those questions -- they don't because they can't, not because they choose not to.
A gemini:// link can't set cookies, but it doesn't prevent serving HTML or any other type of file. However, a browser may disable HTML with Gemini by default, or not support HTML with Gemini at all. Doing so may be useful in order to more easily answer the questions you mention.