Very good points, Nicholas - and ones I should have raised myself, heh. Always is security issues to be aware of when you start noodling around with custom ROM's and such.
Android isn't for everyone. I still use an iPad on a day to day basis, mostly because a lot of my content (books and movies I enjoy re-reading/re-watching) are locked inside the Apple ecosystem.
A lot of people have terrible, terrible experiences with Android as a whole, and honestly, IMO - the single worst thing about Android is the fact that every different handset maker slaps their own goofy interface onto the darned devices, making the whole experience seem very fragmented and disjointed between different manufacturers. I find vanilla Android, Jellybean in particular - to be just a killer mobile OS. If for some reason I was forced to go back to Android with TouchWiz or a specific manufacturers skinned up variant of Android I'd probably rather use a feature phone, heh.
I feel yoour pain. Whenever my Dad (In his sixties) asks me for help with his SGS2 I get so annoyed with it as it's the stock Samsung Touchwiz ICS ROM on there and I'm so used to Cyanogen it really bugs the hell oout of me trying to find things in the settings. Especially when he's asking me to help him "blind" over the landline so he can fix whatever problem he's having.
I would love to root it and install Cyanogen oon it for him but he uses the Sky Go app to watch sports and movies as he works 12hr night-shifts and the damn app refuses to work on rooted devices.
I did install the DTV India app for him as it has all the sport channels he needs but not the movie channels that he pays for as part of his Sky TV satellite subscription.
He is thinking of changing from Sky TV for Virgin Media Cable TV so hopefully when he does I'll be able to put CM10.1 on the phone for him at last as the Sky Go app is tied to his satelllite subscription so will no longer work.
On a related note my Mother-in-Law (Also in her sixties) has had an iPhone since the day it was released in 2007. She's never once installed an app on it nor has she upgraded the OS on it. She uses it for phone calls, text messages, mobile Safari and nothing else whatsoever.
She might as well have a feature phone! lol