Well sure it doesn't make sense, but the alternative?
Instead of one Pioneer supplies shop you would have a number all selling guns, some selling suits, others just selling supplies like first aid kits, all scattered around with booths offering taxi services, illegal black market agents hidden away in dark coffee shops and booze dives, an entire city of confusing passages and streets, and that sounds good to me, but players in a hurry don't want to run around looking for shops and poking their noses into dives looking for good deal on illegal missions and going to a several taxi services to find one cheaper, or that even runs to the backwater drilling settlement they want to go to for their mission.
So what FDEV did was put everything in one place to make it easier for players, it's a decision, some will like it, some won't.
I think there's several possible middle grounds they could have taken between hyperrealism and nonsense.
I understand the desire for an "airport like" area with available essentials (I think there should be other options as well), but they could have made the layouts somewhat variable with more visual differentiation between the super powers, as well as independent stations even if the sevices were essentially the same. Not even huge and sprawling, just not an identical layout no matter where you go.
With taxi services, have the companies be regional. One service per region Make company names/signage/logos for a few big corps. Then for small, one station services, use the same method they use to name stations/settlements/factions.
Ships could have a generic taxi checker marking.
Then you only need the one kiosk in the concourses and it's less stupid.
For the equipment, you can have the shops be based on economy and populations. Some might have a separate armor, gun, and consumable stores while some smaller ports might have just a single general store. And the stores could be near each other for the lazy folk. And like the taxis, a few big company names and then some procedural names. It's not like the game doesn't do that A LOT.
THEN instead of Frontline Solutions, just make a state based Kiosk. When at war, it's a recruitement office that functions the same as FS. Famine, it's a food distro sevice. Outbreak, it offers medical transport passenger missions. That way the space isn't useless when the faction's in the wrong state.
To replace the bartender, have something as basic as a pawn shop for item trading, or a salvager store. Anything would be better than the ancient society of bartenders.
There are many things they could have done other than making a single model for each station size and then plopping them inside the models. They didn't even remember some surface ports don't have shipyards, so some have empty inter astra stores just taking up space.