I ALREADY SELECTED A CHAMPION WHATS THE POINT OF LOCKKING IN?

Confirmation is important.

It's mostly to keep people from taking the full time when they already know what they want to play. Just hit the big, orange button. Not too hard.

If you know what you're going to be playing even before the pick and ban phase you should already have proper runes and masteries on.

You have six bans and depending on your position 1-3 turns to pick your champion.

Confirming shouldn't be so hard, again.

There is a phase for DECLARING what champion you're going to play.