All industries come along with its positives and negatives. One of the “perks” of being a rebbe or morah are the days off. If it bothers you to no end, petition your boss for similar perks, or join the industry. So easy to whine and complain about everyone and everything.
Don’t be an idiot. If it bothers me no end, I can change it.
Who do you think sits on school boards? Morahs or baalei batim?
If the kids need vacation, we can always have training days.