The whole point of a DDOS attack is to deny service or access to those trying to login to the server(s).

The simplest way to stop a DDOS attack is shut the servers down. However, that doesn't tell you anything about how the attack is reaching you and how to prevent it in future. SE needs to know as much as they can about what's happening now, so they can (hopefully) prevent future, similar, attacks -- while they're working to stop the attack and get the servers available to us again.

Asking (or demanding) an ETA on when the attack will be stopped isn't reasonable. We have no idea ourselves where it's coming from or what it'll take to stop it. Or if there's more than one DDOS going on simultaneously. Or many factors that can contribue to the severity of the situation.

I know it's hard to be patient but... that's all we have, at this point.