[_jal]

Anecdata: Before I deleted Uber, I had two bad interactions with drivers (including one who threatened violence in response to I have no idea what, some misunderstanding). Since only using Lyft: zero.

That also stand in contrast to exactly one two experiences with cabbies over ~25 years.

I conclude, based on my limited personal experience, that vetting drivers makes a noticeable difference in driver quality.