Field of view matters! Magnification shrinks FOV. So much so that anything above 12-15x (imo, that’s somewhat subjective) shrinks FOV so much it become detrimental for hunting. You can’t find animals quickly, can’t spot your hits, can’t see where the animal went after impact, can’t get back on target for a follow up, etc. And if your reticle has wind holds (you want those) in order for them to be accurate, you need to be on max power. So in essence, in order to use your reticle property for wind, you need to be at max power. Now your FOV has shrunken to the point of being a negative factor. Furthermore, there is simply never any need for more than about 12-15x for hunting. Never.
FFP “fixes” this because you can simply crank down to 10-12x to make a shot and your wind holds (subtensions on reticle) remain accurate at all power ranges. Or you could crank up for range shooting and to really get your zero precise. You just need to make sure the scope has a reticle that is visible at the lower powers. That’s the hard part. That said, they are out there.
Also compound the above with the fact that to get big mag, yet still have a usable low end mag, you usually need big zoom erector systems (6-8x+). High zoom erectors can cause problems (tunneling, focus, tight eye box, etc) that all make a scope less user friendly. Especially for hunting when you may be in awkward shooting positions.