There’s a very strong correlation between bac and driving impairment. To call it nonsense based on highly suspect anecdotal evidence isn’t at all cogent.
This is just more of your holier than thou, moral superiority shtick you love to whip out every once in a while. Alcohol and drug impairment is based on a multitude of physiological factors that you obviously don't have the slightest comprehension of. Alcohol and drug tolerance is affected by psychological, genetic, and behavioral factors, among others. The brain is an incredibly complex thing that works differently for every person on the planet.
For instance, I can pop 2-3 vicodin and have absolutely ZERO effects when it comes to alertness, drowsiness, sobriety, pain relief, etc. They don't do anything for me, and never have. No, I was never a habitual vicodin user. I have taken them 3-4 times in my lifetime due to injuries, and thrown them away every time, as they are useless. Ibuprofen, on the other hand, is a life saver...
A regular marijuana user can have "excessive" amounts of THC in their system by normal standards, and be completely sober. When I pop edibles, 5mg is enough for me. I know regular users than need 4-5 times that amount to get high.
Should I continue?
If your stance is that you should never drive with any amount of alcohol in your system, because any impairment while driving is too much, then I'm sure you would have no problem revoking the license of anyone over, say, 60? Because, you know, cognitive and motor skill decline is 100% a factor as you age, and those older drivers are operating their vehicles much more dangerously than someone in their physical and mental prime. Right?