Repotting a tree every year will cause it's demise.
Such frequent root disturbance doesn't allow roots to develop to do much of anything. A wait of at least two years is in order for younger trees, perhaps three, less if you want to develop trunks and other big developmental stuff.
I can agree with the last part of this, but done properly, repotting a maple every year will cause it's development of a good nebari.
This maple has been repotted every year for the last 8 years, removing probably 75% of the roots, bare rooting, blasting with a hose, and planing off the bottom of the trunk ...and will probably need to continue for the next 3 until the tertiary roots thicken and develop. It's the only way to develop a decent nebari if you aren't fortunate enough to start with one.
Akhater, I do agree that you could have taken more, but the goal of removing more isn't for the sake of removal, it's to ensure you leave only the roots that are radially spread, tapering and ramifying in a pleasing way. Waiting 2 years makes this more difficult if you're trying to sort out roots close to the trunk. Read up and you'll be ready for next year. Keep a good eye on watering now...