This would probably work great for older non-techie relatives’ tablets as well.
iOS is very much not built with this level of multi account fine-grained permissions in mind.
I trust the GrapheneOS dev when he says the security chain is great on pixels and that supporting more devices is kinda a nightmare, but the whole pixel+grapheneOS package is just not as appealing at that price-point
You should install Graphene if and only if you have zero need for steam, discord, or anything not in F-Droid AND you actively want to use your phone less. It makes your device drastically less desirable and useful.
If all you ever do on your phone is open a web browser and SMS AND you don't rely on voicemail, Graphene is pretty sweet.
I love the concept, I just found it incredibly impractical. I switched to lineage after six or eight months.
The real thing that made me switch was multiple OS updates per week. The incessant forced updates from Samsung is why I switched phones and installed Graphene. It got so bad that I had to block the persistent update notification and just went without for several months. Lineage is a little more respectful in this regard.
I've not had any trouble with play apps from the sandbox, even finance ones and I let it reboot itself when idle for updates which to my surprise has never caused it to miss a wake up alarm. Now that Android One is dead I'm not sure I could use an Android Phone without Graphene. It is a shame another manufacturer isn't supported though.
So yeah they "work" but not completely.
You also absolutely cannot sign into your work Google account due to device security. Fully unsupported. Voicemail doesn't work for some of the largest providers, so I have to call my own number and navigate the menu tree like it's the 1900s.
Graphene makes a lot of compromises for you and the attitude seems to be that Graphene knows better than you what's best for you and your device. That's why root access is explicitly forbidden.
FWIW, Discord notifications are working fine for me.
I also strongly discourage signing into work accounts on your personal phone. It's a privacy nightmare. Have them buy you one. Turn it off when you're not working.