Welteam First, one should not confuse "Tor" and "Tor Browser" (aka. Tor Browser Bundle). Tor could be described as a routing algorithm designed to allow two parties to connect through TCP (and TCP only) without neither the client, the server nor the network knowing both client and server. Tor Browser is a Browser whose main specificity is to route all traffic through Tor.
That is true, I was in my head considering using Vanadium behind Orbot equivalent to using a desktop Tor browser and I agree about those differences you outlined.
having said that, however, while I agree with your statement about that Android TB may not be as reliable as the Desktop TB, seems to me that if I were to install Twitter on a grapheneOS phone which is using Orbot/Tor as a VPN, it gives me much of the same protection (though I admit not all) as a Desktop Tor browser
- My IP is hidden
- the app is not able to see devices on my local network
- Most of the "identifying" settings on my phone as generic and not specific to me due to being a mass-produced phone (the only identifying settings is probably things like the timezone)
The only issue I really see is the data that the Twitter app would itself save to my device and if I do not give the app permission to anything except Network and Notifications, I have a hard time seeing how it can glean anything useful about me in particular.
Finally, in regard to your threat model, using Tor is the first step but your focus should really be on the activity of your account. Do not reveal any personal info, limit interactions with anything with a sphere of influence below the national level, limit interactions with real world acquaintances, limit activity revealing political or religious belief, etc.
This I agree with. And I use my twitter account only to follow folks/organizations I find interesting or to save things to bookmarks. I have no interest in ever tweeting in an effort to ensure Twitter can't build a profile off of me based on what I tweet, though I am sure they already have a profile of me based on who I follow.