In many cases I think mobile wallets are a reasonable mix of easy UX and security (as long as your phone isn’t rooted, etc). For larger amounts, or power users, they aren’t great, but at least they’re easy enough to use for newbies. Some of them allow you to connect to your own node, so at least you have some privacy there.
Unfortunately, no mobile wallet is fully featured, at least on iOS. UTXO selection, manual fee selection, would be nice.