The fact that one can just ahead and cram for these problems should pretty much... severely downgrade, at least, their usefulness as hiring filters.
It’s a how-bad-you-want-it filter. Plus a bit of an IQ test (to recognize which solution applies—of course even more studying can help here, too). It’s working as intended.
It’s a how-bad-you-want-it filter.
As long as that's how it's thought of - I can see the value.
I think people are in the habit that it does a lot more than that, though.