Well, it depends, but before you skip on next article i will need to say one more thing or few.
All kind of sport in this world need some kind of mobility. For example people who swim need to have good shoulder mobility, soccer player need to have good ankle mobility. Tenis player need to know how to use their T spine properly. Many people use mobility in tearms of weightlifting and general fitnes.
It is true that most peple can not squat below paralel. Some dont know how to open their hips, others have rounded back, other go squat on their toes. So my perspective of mobility is that you need it as much as your sport demand.
Lets say if you want to do weightlifting, and lift snatch and clean and jerk. If you are regular Joe you will need a LOT of time to be able to do simple exercise as overhead sqaut. God forbid to try snatch with 145lbs or 61kg. It would be imposible. I dont say that you shouldnt do them. Yes you should, but you will need more time but as result their is no mobile athletes then proffesional weightlifters, Maybe gymnast but if you dont start as kid it is pretty much pointles to hurt yourself at age of 25 😀