>>madars+(OP)
The main missing feature is password under duress that would open a different “user”. So even if you’re forced to give away your password they won’t get to the real account (some hidden profile or similar).
At least hidden profiles would be good enough for basic protection.
>>throwa+Ou
This hyperbole is extreme, and unnecessary. If your life depends on the ability to simulate a fake user on a phone, there are more significant problems than a lack of operating system features, and a general failure to defend in depth.