It’s part of how you can gather materials more on demand or long term than hoping you loot some or going and buying them, and it’s about being able to make your own space to live in and feel like you made something neat.
I tried to make a ship to live out of with every crafting station and tons of cargo, but the ship just ended up massive and unwieldy to move around in.
I ended up creating a base with lots of organized storage and such so that I can now have whatever size and kind of ship I want, just for funsies, and I can leave all the storage and crafting shit at “home”.
I’m glad they let you gain materials and such in different ways, so if I really really wanted to, I could just bust my ass running missions and use my money to buy mats.
Well, I enjoy them, and enjoyment is the point of me playing this game. If you like things like Minecraft or Terraria/Starbound/the building portions of Valheim, then you can find enjoyment in outpost construction. Otherwise, you might like it as a way to make resources or a way to store things and have a living space without resorting to a ship that you’re locked to because any other ship not made to accommodate all of your crap and need for workstations won’t do.
The pros are not purely creative, but that is a pro if you’re into that. Every game has parts that some people will like and others won’t like, just because you think sandbox elements have no point by definition doesn’t mean someone like me won’t enjoy noodling around in Garry’s Mod without any mechanical incentive. Exploring the mechanical space of a game and creating just to create can be fun. Not for everyone, but it can be in its own right.