Well, yea, I believe the idea of summer vacation was implemented because the kids were not going to school over the summer anyway, they were out helping around the farm.
But since that’s not an issue for most kids anymore, why not move it to a time of year where kids are out with the flu, families are on vacation, there’s numerous holidays anyway (and those big breaks are worse than a 2 month vacation because teachers plan on a month of review when you come back, they don’t expect to have to start over from the beginning in January because you fried your minds playing video games over Christmas), and of course, there is the risk of frostbite, hypothermia, collisions because of crashing in the snow, etc, etc, etc. We had nearly two weeks off last year because of record breaking cold days and were afraid the children would get injured (frostbite) if they walked, even iwth heavy parkas and mittens!
There are risks in summer too, but they are more easily controlled. You can over heat (get water and sit in a cool building when you get there) and of course you have to enforce some kind of dress code or the kids won’t even bother to get dressed.
Meanwhile, numerous districts are talking about canceling summer break altogether and having year round school. Guess that would be okay, but don’t kids need time to be kids too?