Serious question, why do updates always hit during important moments?

I was in the middle of my online class when my tablet suddenly said it needed to update. I tried to click 'later' but it just started anyway. It took like ten minutes to finish. By the time it was done, the class had moved on to a new topic. I had to ask my friend for notes, which was embarrassing. Why do updates always happen when you're busy? It feels like they time it on purpose. Now I'm behind on the material and it's just annoying.