Some people have a harder time tasting/noticing harsh synthetics/non-flushed buds. I know lots of people who would never notice a difference. To each their own.. Alls I know is I notice a huge difference, & @ least 70-80% of the commercial stuff grown here in Co was not flushed and overfed. All of the top notch growers here in CO, CA & Oregon that I have met swear by flushing.. And that is people in the industry selling their product for 2-3x what everyone else is & that have won multiple cannabis cups.
I guess some people just don't have as sensitive taste buds/lungs
I feel bad for people not flushing, unflushed weed is bad for the throat ESPECIALLY if using synthetic ferts. Mineswell be smoking tobacco then.
Oh well, I guess if your coming from a commercial stand point where you're selling most your product in bulk, then I could see where someone would want to argue against flushing. Much cheaper and more cost/time effective than flushing.
To each their own though.
P.S. You can taste pesticides if sprayed in flower, there is a HUGE night & day difference between that & unflushed weed. I use to smoke over an OZ a day, I have literally smoked 100's of LB's throughout my life.. And there IS a very big difference between unflushed vs flushed weed, cured vs uncured weed & pesticide sprayed vs non pesticide sprayed weed and synthetic vs organically grown weed.
Everyone's gotta figure out what works out best for them though.