I believe you are correct. The other replies are really not addressing your critique at all. Both solutions require some form of "alerting", when not just do it

I believe you are correct. The other replies are really not addressing your critique at all. Both solutions require some form of "alerting", when not just do it the proper way. Worried about how long an alert will take to respsond to? Well, alert when 16GB remaining, you just bought yourself more time!