My objection is to the justifications people are using to walk this path. Even here, we have different people trying to argue completely different things regarding the isolationist nature. You say that it can't be isolated, Gormo says it's "designed to be airgapped".
Look, I've spent quite a significant amount of time exploring alternatives for a saner web. I've got on the microformats train. I know my way around the indieweb. I'm right now working on some stuff that I hope can make the fediverse easier to use and more accessible. I'm not saying to give up the fight. Quite the opposite: to me it seems that the Gemini crowd is just playing with their toy miniature soldiers and claiming that this is the best we can do. It seems immature and poorly-thought out.