In fairness to Tobtorp's position, getting Max or Egrimm to learn would come with a side of Mathilde learning it herself, so there'd be built-in redundancy, whereas we don't double-dip with Adela (since she doesn't cost us ongoing AP commitment).
I still think it's worth it: having a dedicated pilot whose only job is ferrying people around means we avoid running into the situation where we need Max to do a job in Altdorf but Egrimm needs a ride to Hochland and Mathilde has to be in Karak Eight Peaks and we can't leave the wolf unsupervised on the same side of the river as the duck. And I don't think the lack of redundancy is likely to cause problems until and unless we start outfitting the gyrocarriage for combat operations, which seems a long way off if ever. But it's a weak spot in the setup that we might want to address at some future point, if we can spare the time.