The Bishops have decided to allow Catholic schools to open on Holy Days if they wish. I think it's a sensible decision.
I don't know why any Catholic school should be so keen to be open on a Holy Day, but I presume that Mass will be a feature of the school day. I think that this is actually better for faith-building than simply having a day off.
However, if Mass is not part of the school day on Holy Days, then my kids will be missing an hour or so of school on those days.