You probably have a friend who you can count on to tell you the unvarnished truth about yourself. Does your breath stink? Are you being a jackass? Are you too drunk to drive? etc. This friend’s honesty is annoying, but you keep him around because sometimes, dangit, you need to know the truth, and nobody else is man enough to give it to you straight.
The overhead squat is your annoying friend in the gym. This movement mercilessly exposes your weaknesses, and deflates you when your head starts to get too big.
Do you struggle with the snatch? Do you lack core strength? Do you lack power or torsional stability? Do you have poor balance? Learning how to overhead squat can help remediate all of these problems.
Like the other kind of friend, the overhead squat challenges you to grow, which is why you should embrace it, love it, and spend time with it.