I've noticed on a few occasions that "lengthy" reasons for a Yes vote get cropped 
It appears that the No vote reason box correctly limits a users comments, so you know exactly when you have run out of characters (and can therefore rephrase things to fit), whereas the Yes vote reason box lets you type more than is accepted and then crops the text, so it doesn't always make sense.

Could this be corrected so that either the Yes reason box enforces the current displayed length (which seems to currently be 150 characters), or if the Yes reason is supposed to be longer can it correctly display the whole Yes reason after submission? This would make it consistent with the No vote reason box behaviour.

Just checking the HTML code, I can see a 'maxlength="150"' in the No vote reason box code, but no such restriction in the Yes vote reason box.

Sometimes, people vote yes because they feel it's good enough to be accepted but want to point out any errors.

Sometimes I vote yes on a contribution but still have doubts about it that I can't confirm or deny at that moment. So I put my concerns in the yes comment and hope that the contributor did it right in the first place or re-checks my issue.