That kind of setup would be on pvp servers.Yea, no... Seriously, no.
Ship mass capped at 1k mass would so ridiculously limiting.
On servers where you want to display your cool looking ships the maximum ship mass would be much higher.(but on those servers you do not care about how your ship perform in a fight)
I mean any ship above 1k mass is massively problematic as soon as it goes near a planet for example.
Or when you can start putting more than 30 turrets on a ship(for pd purposes probably).(turrets increase ship count and collision calculations at a crazy rate)
In fact It is often hard to have the game run at a good speed as soon as you reach masses like 30k during fights(while it does not seems that huge for me) and if you have multiple 30k+ ships it becomes less and less good