Why are blueprints disabled?
Rebuilding ships over again is not fun, might as well make bricks.
Is this what the server encourage?
Sure seems like it, whenever intentional or not. TSA seems to encourage bricks and ships that are painfull to look at.
Take less time and less resources to build while still able to be "overpowered"
If they want to disable BPs then they can, but the reasons they state as to why they did are not valid, disabling BP uploads won't shop "overpowered" ships.
Disallowing BP uploads ultimately causes ships on the server to look like absolute ass because those things take a decent amount of time to build in creative mode, and tsa expects people to do that with limited resources and re-build said ship every time it gets destroyed? Tedious, unfun and serves no purpose. People are not gonna build pretty under these conditions, its all gonna be Joelbrisco styled doom cubes at the very best.
But at the end of the day, the server admins have the final say being the admins. If you don't like it, you can simply not play there. If you want others to know about how bad/good this server in, make a post in the general subforum.