I can't really speak for anyone else's success with/without Scent control, but I can tell you that the last few years I've really elevated my Scent Control game my sightings and shot opportunities have skyrocketed.
This year during the 3 weeks I hunted IL I sighted over a 100 deer out of my Treestand, of which 60 to 70 were bucks. I easily passed a dozen borderline Bucks and had a few deer that ended up downwind of me without blowing my cover.
I also had the Wind switch on the day I shot my Muley taking my scent straight to him as he came along.
Maybe I've just been Lucky??

At any rate I won't change what I'm doing because it's working for ME
Dan