Just had this exact conversation with my son that made me got angry and went home!
In my view, baseball is FUN because it has all sort of combinations and outcomes. The fun comes from when trying something different all the time. But to answer your question directly, NO!!!
Today at batting practice, I pitched him a C7, he made contact, so he could not squared up. No issue here. My next pitch was B5, smack down the middle, he swung and made a contact like hitting a B8. I asked him why he didn't SQUARE UP. He got "irritated" and replied why did he need to SQUARE UP if he could hit the ball. Then I asked him why his coach always insisted on his batting mechanics to SQAURE UP during lessons. He replied that was just for the lesson.
Moral of the story, my son is an IDIOT! If SQUARING UP can lead to a great line drive, it's perfect, but in reality, no one sees a "down the middle" pitch every single time. One needs to have fingers, wrists, elbows, and shoulders to be "flexible" in combination with your whole body in order to hit the ball "squarely".
Good luck and have fun.
"Idea" promotes "Attitude", "Attitude" encourages "Rebellion", "Rebellion" evolves into "Revolution"!!! --- Alex, 6/28/17