@Kimsemus and
@Recatek have valid points and it really comes down to what kind of game this wants to be. If the game wants to be a creative-mode ship designer like SE and so many other games, it can do that. That's kind of the default at this point. Pretty much all comparable games offer these kinds of individual servers with creative mode and they don't focus on the MMO component. Rarely does a game come along that can give a single shared world. Starbase seems to have the technical capacity and the desire to become an MMO, and has labeled their game as such. They didn't just think "multiplayer servers" - they thought bigger than that. So instead of thinking what features you'd want personally, what is best to achieve success for that implied goal?
Even larger MMOs like WoW and ESO and GW2 and so on have big servers, which are clumps of smaller servers that handle a fairly large volume of players each. How they achieve coalescence into a single shared game world experience is by having all players experience the same content across all those servers aka "Theme Park MMOs". People on two different servers can beat the same raid boss and discuss with each other how great the fight was.
Starbase and the like are different for sure. There's an element of ship design and building. But this is not the main game, it's a subset of potential options due to the tools provided. The entire game can be played without a single ship. It can be all station building and floating around to acquire resources, and combat could be FPS shooter-PvP taking objectives on a station. The game is not "build your dream ship and fly around" - although this is possible, that isn't the entirety of the game. Starbase comes across more like Minecraft-in-Space. Do what you want. Build whatever you want. The history of the game and what it is will be defined more by the player actions with the tools they are provided than by any set intended feature. For all we know, ship building could be completely automated at some point, and no one spends time building new ship designs because there's more interesting and important gameplay going on.
Like it or not, by being an MMO, you are window dressing decorations by others, by design. That's part of the MMO experience, like seeing some fully geared guy in any MMO. That's something you as a player cannot control. You are an integral part of the product. The real difference is that such a thing can matter. You will build a nice looking ship not only for yourself but for the reaction you get from others.
You could make the argument that leveling up in any traditional MMO should be done offline. After all, it allows you to level up on your own time, without interacting with other players. And 5-man dungeons? They should be made to be 1-man dungeons when you're offline. But this misses the whole point of the MMO experience, which is that you are around other players. That's the entire success of MMOs. No one is playing WoW to solo the 40-man raid. They want to do it because there's 39 other people there, with them, accomplishing something that matters.