3k gravity-immune raid starships.
What does that have to do with anything?
Not exactly in line with the OP, but I think it falls under the closely related topic of "kill the player by any means necessary".
There is one notable difference however, which is that the Avenger feels like a final boss of sorts. A slow lumbering beast with a ton of guns sounds much more fun fight than a lightning fast zergrush from 3000 ships. I mean who'd rather fight the imperial fleet than the Death Star?
Except 3000 Gravity Immune Raid Starships beelining for the player's home command station? The player just lost.
They are already tractor immune so nothing will slow them down and with their fast move speed, no unit will get more then one shot as they go past and only 10 need to reach the players home command to kill it in a single salvo as they are already FF immune as well.
Really, the really fancy stuff may be in the expansions but the base game AI has plenty of tools to murderize players as it stands.
D.
