A fully functioning Airlock just makes sense from a world building perspective: Not being able to close the door without exiting the air lock is just asinine and makes no sense if your going for realism. I get that it's science fiction and all, (and all the campers would cry a little inside if you shut the door on them and Noped out.) but as a player being immersed in this world, I have a hard time willingly suspending judgement concerning the implausibility of an airlock that forces you to leave in order to enter again: It's simply bad design, and does not belong in a space ship, real or fictional.
Now lets say the campers still want their option to try and turn you and your unsuspecting buddies into red mist? Simple: you could make the console in the station hackable with some sort of new consumable, forcing who ever comes through from their ship next, to keep the doors open for a predetermined amount of time.
Does this sound fun to me? Nope, not really, but it makes more sense thematically speaking over an engineer forgetting to add a "Close door" button to the console inside YOUR VERY OWN SHIP'S AIRLOCK. If I were the project lead on said spaceship I'd fire that Engineer's ass, preferably out the airlock into space.
Setting aside mechanics that make no sense from a world building perspective, their are other problems in not being able to close your Airlock from the inside:
BALANCING.
Like it or not, it isn't balanced, and heavily favors what ever team is best equipped, most staffed, and quickest to reach said raid area. If that's what your going for, then by all means, don't do anything. But if what you want, is a large player base for your game, your gonna have to make some concessions.
If you trying to appeal to as many of your player base as possible, you need to let everyone choose from the different activities you have given them in your game without being punished for doing so.
What I mean by this is you are creating an artificial barrier of entry for anyone who isn't rushing as fast as possible to a specific raid area, in order to avoid, or set up an ambush. THIS CAN, AND WILL LEAD TO A BORING META TYPE OF GAMEPLAY, WHERE EVEYONE IS DOING THE SAME THING, THE EXACT SAME WAY. PREDICTABLE. BORING.
FIXABLE? YES. Simply add a "Close Airlock" option in your ship when you are docked and in the airlock.
DO YOU WANT PEOPLE TO HAVE A REASON TO FIGHT IN THEIR SPACE SHIPS? OR JUST BLAZE FORWARD TO THE NEAREST RAID AREA TO AVOID AN AMBUSH?
**NO ONE LIKES TO BE SOMEONE ELSE'S PUNCHING BAG PURLY FOR THAT PERSON'S ENTERTAINMENT ONLY.**If I load in, and hear the enemy team clamoring around outside the airlock door, being sloppy in setting up an ambush on me, they should have the door slammed on them until they can figure out how to properly execute an ambush, silently, and with deadly resolve. (EXCEPT THERE ISN'T AN OPTION).
Instead I get a bunch of noisy armatures who will still likely kill me because they have numbers, the high ground, and whatever God-tier weapons they looted before I got their.
I can respect a good ambush executed on me, or my team: But hearing the other team all but yell out loud as I load in because they know I can't shut the door is emersion breaking, lazy, and just plane unrealistic.
In a situation like that, who's to say that I wouldn't just strap myself in, boost away from the station and, purposely decompress the entry way sucking them all out into space? I'd say that's just as likely, if not more likely an option if I can't close my door.
And that doesn't even cover how unfairly the odds are stacked against solo players: Yes we all know space is a dangerous place, but it is especially dangerous for those who go it alone.
Personally, I like the challenge of the occasional solo run. What I don't like, are situations that only have one outcome possible.
If you want all your players to have a chance at having fun, you need to add an option to close the door.