First anecdote:

I’m convinced driving stoned is still a problem (though I understand my experiences may be an outlier);

My friend used to drive stoned regularly, and while in the car with him he failed to notice traffic lights and stop signs. These are mistakes he didn’t make while sober.

Caveat: he was an inexperienced driver at the time, so he probably hadn’t developed intuitive driving habits, so being stoned meant he needed to manually assess every action.

Second anecdote:

I feel that driving drunk is so bad, not necessarily because of distraction or motor control (though once sufficiently drunk, these are absolutely an issue)

I feel the most dangerous part about driving drunk is the overconfidence which comes with it. People are much more likely to take risks while drunk. Conversely, people who are stoned are paranoid, so they’re locked in and focused on not looking like they’re driving inebriated.