I had no problem with it, and no one else should have, either. There is an argument to be made that remaining closed until the summer was also a good idea - the warmer weather was going to limit spread significantly.
Summer programs should have been open for everyone. The results were excellent everywhere that these programs were available. And in the fall, schools should have been completely open for kids. There was ample time to prepare, and there were plenty of options with digital infrastructure to offer virtual access to the classroom instruction. And for any teacher who didn't feel comfortable doing in-person instruction, the same infrastructure could have supported them: They could have taught remotely to the kids in the classrooms.
There is no excuse for the schools led by teachers' unions to be held hostage while they made a list of unrelated demands.