How come Aarindarius didn’t warn Vaarsuvius against hir specialization choices?

[Peelee]

Yeah, unfortunately, we just had you.

Hardly my fault y'all cheaped out on the dragon package.

In all seriousness, who's to say A would teleport in? Maybe A lives within flying distance of Ivyleaf (plausible, if V has been doing their apprenticeship while also courting, marrying, and adopting kids with Inky). All the fiends say is "intercede." No mention of how Aarindarius would get there.

Also a good theory, especially of V expects the dragon to be long-winded. And given how long she toyed with V, that's definitely possible.