Pretty much this. I have used mobile wallets for small amount for years, and I have never had a single issue or lost a single satoshi because I use a reputable open source wallet, I don't visit random websites or click on random links, and I don't download a bunch of pointless spyware apps and games.
agreed. i use an open source android wallet. i created it in 2016 on a samsung note 4. been using the same wallet (ie same seed and software - i just reenter the original seed on the new phones as i get them) so 6 years of having it on android. i just make sure the phone has a (still supported) fully updated OS and wallet. get a new phone when the old phone stops being supported (or sooner). no rooting. no real junk. so far so good.
of course its always been small amounts but still 6 years of phones that use the same seed and same wallet software that are generally on 24/7/365 and zero problems.