Smartphones are not secure computing environments. Regardless of os, storing life savings on a device CAPABLE of internet connection is foolish. There’s a reason hardware wallets were invented.
If it’s capable of an Internet connection, it can be remotely attacked, and your funds can be stolen. 
Appreciate your take. Any proof out there that a phone has ever been hacked like that? Just curious. I personally use a HWW but I always wonder about alternatives even just as a thought exercise.
Many instances of remote attacks, for example the Pegasus spyware targeting journalists using iPhones a while back.
Snowden did an interview demonstrating why he removes hardware from his phones and only uses wired headphones. If it has a wireless radio, it can be compromised.
Not to mention supply chain attacks where your smartphone could be compromised before purchase. This is why the community recommends open source hardware/software in an airgapped device as the only secure option long term.
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