Cellphones engineered with crypto security in mind

Been seeing a number of cellphones recently engineered with crypto security in mind (Samsung Knox in particular is the one I have been considering).

Based on marketing... the chips are engineered with offline segregated portions of the chip that can store keys, can get a message as an input and sign it with the key, but the key cannot be read directly from the other online portions of the chip.

Is this just marketing gimmicks? Actually better than standard online wallets... or even similar security to hardware wallets? Curious if the more technically adept know if these are good options.