Voice is used for some strikes, and last seasons interaction with Crow…but you are right. Fairly useless as a vendor. Also you probably get better ships as random rewards, dropped from “the wild”. It would be neat if our sparrows or ships actually meant something. Like sparrow races, and you could buy upgrades from her. Another idea, maybe have us actually fly our ships on missions, or to and from places vs a cut scene of our ships. Again upgrades for speed or weapons could be brought from her. Could maybe fight or evade enemies in some quests.