By "being a ship" you're not meaning that literally i.e. you as the player Cmdr = your ship or SRV right?
Because I've seen a lot of posts in which Cmdrs seem to believe the equivalency in that statement. Which is their apparent rationale for the need NOT to have space legs. They typically argue your Sidey/Conda/SRV doesn't require spacelegs to scale a mountain/hilly terrain to admire the vista on a planet. And are the ones who point out the existing game infrastructure (like docking inside space stations, landing on planets, the relative ease at which you can conduct trade transactions and perform missions etc) were all designed by FDev to support this argument.
That may be true. But you can't really explore any caves, narrow crevices with Sidey or SRV. Or properly inspect POIs like alien ship wreck on planets, and artifacts like Guardian tech or Gen ships on an intimate, up close and personal level. Not suggesting the gimmick of space mining with space legs here (although that would be a nice fluffy feature they could coinsider adding in a later update if space legs is a go). My point is planetary exploration and emergent game play created by EVA activities (ship repair, ship abandonment to 2nd vehicle/SRV if your ship becomes disabled in space/on planet, PvE v NPC and PvP FPS activity etc), can't be performed by your ship or SRV. That sort of game play really requires space legs for both practical and immersive reasons.
My counter argument is the player Cmndr isn't the space vehicle, but your Holo Me PC who sits inside the ship/SRV. Because why else would FDev bother to include a free floating camera views that shows you your Holo Me Cmndr sitting inside their ship in the first place? Your view would've been permanently locked to first person view with no interior ship views. Why else would FDev bother to provide (if not conceived on their part this was probably at fan base request) a Holo Me skin changer wardrobe menu aboard your ship, where you can customize their clothing/armor SEPARATELY from your ability to customize your ship and SRV skins?
Why? Because space legs have apparently remained a potential dev feature addition since the game was released.