You've never won anything then?

[ Midorima can't see that even functioning. Playing for the sake of playing, practicing, that's fine and all but.. ]

If you don't play against others and win or lose, you can't improve. You can't hone your skills or become a better player. You're only the strongest until you meet someone stronger, but only then can you become stronger. Otherwise it's just killing boredom and eventually it won't even amount to that.

[ He speaks from experience, knowing someone who went through that roof and ran out of things to make it fun. ]