There is room for debate about what shouldn't be in competitive modes like EASHL or HUT. Its trying to get the right balance on a spectrum where one side is pure E-sport competition and the other is full NHL authenticity. Everyone is going to have their own opinion on how to strike that balance so its a tough needle to thread for EA.
That said, I agree with your opinion. Personally I don't mind a small amount of RNG in EASHL, but the way its currently implemented via glass breaking is off. We have the glass break on us at least once every 5 games or so. For something that happens so rare in reality and in-game can shut down play, that's just too much. Much rather it be something we see in a blue moon.