I really don't know why Google especially seems to struggle with this so much.

While Google have really been 'cooking' recently, every launch they do is like that. Gemini 2.5 was great but for some reason they launched it on web first (which still didn't list it) then a day or so later on app, at which point I thought it was total vapourware.

This is the same - I have gemini advanced subscription, but it is nowhere to be seen in mobile or app. If you're having scale/rollout issues how hard is it to put the model somewhere and say 'coming really soon'? You don't know if it's not launched yet or you are missing where to find it.