[ohithereyou]

That only works if you can assume that everybody using the system you're desiging has access to the underlying technology. Sure, if you're desiging some new system (like an autonomous vehicle on a closed loop, controlled system / system purpose built to perform digit recognition as it is written on it, but why wouldn't you just have the user directly input on a keypad) then you'll get a better result, but in the general, real world, case (autonomous vehicle on city streets with other vehicles / recognizing digits from scanned input without the stroke data) then your special case optimization are impossible and for all general practical purposes do not apply, so appealing to their assistance in increasing accuracy doesn't actually do anything to help the system perform better.