It has shit accuracy while unscoped, so if you want to be accurate, unless you're already scoped in you will always be taking a fraction of a second longer to get a kill. That difference means everything when you're going against SGs and AKs, which can both 1 tap at any range. You could literally get killed before even firing a bullet even if you react at the same time. Pros use the SG without the scope a huge amount of the time anyway, this is probably what deterred so many pros from using the AUG now.
Also, the AP might be higher but it still takes 5 bullets to kill an armored opponent, so that literally doesn't even matter at all. The M4 also has higher base damage but they both still take 4 bullets to kill unarmored opponents as well. The only positive of the AP is that it can one tap at very close distances, but because of the aforementioned shit accuracy you won't be using it at that range the majority of the time anyway. The M4 also now has a higher RPM, so it can get kills even faster when stacked with the scope time.
M4 also has faster movement speed and reload time.
I can guarantee that you looked up m4 and aug stats, found 3 stats that look like they support you and just copied them over here without even thinking about what it means. But in reality, the AUG only edges out the M4 at long range, at medium range the m4 will win out because you can fire at least 1, maybe 2 bullets before the AUG has even scoped in, and the AP only comes into play for 1 taps at close range, where the accuracy is garbage because you're unlikely to be scoped in.
All of this makes the M4 more versatile than a scoped auto rifle.
I bet when you wrote "You want stats?" you though "hah, I've fuckin got him now". Spoiler alert - you haven't.