It would be sad if, after all those years, it was still missing anything significant. Maintenance mode sounds like a good thing, not something that makes me tempted to switch to some less stable alternative.
Reminds me of sites that required ActiveX to run arbitrary code on the user side when visiting a web site outside a sandbox. Turned out to not be ideal from a security point of view.
But I guess `ssh -X` users still miss those times...
I suspect you don't really guess that. There are differences between the two cases. For example, security threat models are a thing. Something can be secure against the threats it will face. I don't ssh -X into servers I don't already trust. There is no arbitrary code being run.
