Who do you recommend otherwise? Particularly for professional assistance when I am not around?
Every Best Buy and Apple Store is trained on it. Samsung would be the only other option.
- install one of WhatsApp, Viber, Telegram, Signal
- install one of Gmail, Outlook, Proton Mail
- protect/hide away settings and app store
- lock homescreen icons
It's a pretty foolproof setup. And I'm not sure why you would need a brand specialist to get help for such basic stuff. Walk with a Motorola into a Samsung store, I'm pretty sure they will be able to help you, especially if you are a polite senior.
And I wouldn't assume competing brands would help each other beyond "is this thing on" level checks.
But he's there are ways to lock the system so things don't move around much.