> If iOS or Android added robust support for external monitors, external keyboards and pointing devices, I'd probably switch to it to get the increased resistance against attacks.
They basically do now?
On iOS I've never seen a BT keyboard not pair and I've never had problems with external monitors. Sometimes getting the right dongle so it plugs in is the bigger problem, but iPads have been USB-C for a while now, making it pretty much a non-issue, whenever I've tried.
I haven't tried with Android in a while, but I'd be surprised if it's much different than iOS at this point in time.
Can iPadOS display a UI tailored to the native resolution of the external monitor such that the user need never interact with the iPad's own display?
Is using a mouse with Mobile Safari a pleasant experience if the user is doing many hours of interaction that way?
(Actually, now that I think about it, iPadOS is too restrictive for me: I can't configure it in ways I would want to, but GrapheneOS doesn't have that problem what with being almost entirely open-source.)