And let's all never forget that Windows beats Mac, and Chevy blows Ford away. Oh, and Pepsi tastes better than Coca-Cola.
It's all subjective. There are way too many variables to say one way is better than the other. I have stopped the practice of flushing before harvest, and haven't noticed a bit of difference in taste or quality. I will only flush if there appears to be a nute lockout or nute toxicity problem. But it's best not to let it get that bad to begin with.
As for medicating vs. just getting stoned: I disagree.
Getting stoned is a nice side effect, but there really are many who do use cannabis to mitigate side effects of prescription meds, and also to enhance the quality of their life due to various health problems. Not everyone who uses cannabis just wants to get high.
That being said, no one should ever have to worry about legal consequences for wanting to use cannabis, whether for medical or recreational purposes.
Flushing won't cause root rot if your soil drains properly, the soil temperature isn't too low, or if you have a wicking material inserted into your soil to help the moisture move out of the soil in the pots.