Can agree on this, when trying to look at previous phone examples all I saw was gimmicky overpriced junk or total shitcoinery. 

I think it should be an opt-in change to other devices (like a custom OS) rather than it's own thing, but without integrated support for hardware security it's basically no different to running a hot wallet app on a smartphone. 

final

Is a good initiative, but not realistic.
Many tried before and they end up with very expensive devices that only few freaks buh them. Then slowly people forget about them.