Absolutely. Defence in depth is a good thing. That applies on a desktop too, of course. My point is simply that there’s no reason to worry more about it on a phone than on a desktop or laptop. About the only significant security difference is a phone is easier to steal, and is more likely to be left unattended for someone to try to do bad things with it in place. Firejail and the like doesn’t hugely help with that. Also, firejail can pose security problems for things run not inside a firejail sandbox (the assumption is the users who can run firejail are trusted).
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