It is pretty rarely that we see parking lots for small interstellar spacecraft in Trek. But if this building is the headquarters of the Expeditionary Group or something, then their presence is more than warranted.
Mind you, I don't think the ST:FC craft is actually interstellar - it's better sized and shaped to be a mere lander for a bigger starship (which we know Vulcans have in bountiful supply), and lacks any hints of the famed Vulcan ring drive.
Similarly, the craft rescuing the downed spies in "Carbon Creek" looks more like an atmospheric shuttle (the role we see it perform later on in the Surak-in-Archer trilogy), is surrounded by these same podded rocket thingamabobs, and would nicely fit inside the shuttlebay of one of the larger Vulcan ships. But Sarek's ride in this episode isn't all that large, and definitely has the warp ring, even if in partial form.
...The craft of the spies in "Carbon Creek" also had lots of "fins" that could be parts of a warp ring, and had a warp engineer aboard. So it's a shape thing for me, not a size thing.
Timo Saloniemi