Relative to..?

Fair enough point you're making in the article, but do all other POP3 providing email services send you a warning when you're reaching the server-side storage limit? It's not clear whether you're complaining about Google not providing a service which is accepted as standard, or whether you're complaining that Google isn't providing an extra service which you want them to but they could not have justifiably thought of in advance.

I suspect it's the latter.

By the way, I've pointed this out before, as have many others: Stop assuming you should get better customer support just because you're a journalist. It's petty, selfish and won't do you any favours in the long run.