Perhaps less long holiday breaks, but I doubt that full year attendance would be accepted by families, teachers and/or education and health professionals, all the more that children need to be children. They are no robots.
Like the children, all those in charge of them were and are exposed to too many contradictory or exacting demands, principles, taboos, "standards", fashion trends, unhealthy systems, etc.
Shifting from one extreme to the other is a bad idea ...