the main reason is a hyzer shot is the discs natural tendency... just watch any beginner throw or take any driver out of your bag and throw it softly - the disc wants to hyzer naturally, because that is what it does at lower speeds
on a wide open 300' shot, a pro would rather throw the hyzer, because they can pick a faster disc that they can release on a hyzer angle and never turn it over, because they will not be throwing hard enough to over power it
by playing with the discs natural tendency instead of against it, you reduce your margin for error, thus making the shot more consistent and predictable
there is a hole similar to this at a course local to me that I can reach with a putter, and even easier with a roc and can birdie with both fairly consistently, but I still have to throw those discs quite hard... by having to throw so much harder, I lose a little control and risk turning the discs over (especially if there is any head wind) - instead, I usually throw the big hyzer with a moderately stable driver, and tend to birdie this hole nearly every time I play it... and even on my less than great throws, I am still always putting at the basket for birdie