alt Hacker NewsWell it was definitely a bug. It worked in some cases (I think it even worked in google at first, and then a few days later it manifested). And the feature was advertised, even though, again, they never claimed the software to be release quality.
But my point is that, similar to security, you don't want to build this kind of feature piece meal. Either the containers are fundamentally walled off or they aren't.
I understand what your claim is, I just disagree it's that blanket. You could e.g. absolutely build the UI for a profile switcher before your implementation of the backend changes are merged without carrying implications of how well that will handle isolation in the same way in security you could implement the null cipher in TLS to test that portion of the code without it forever implying you have bad encryption.