It’s a pretty standard bandwidth/latency tradeoff in my view: email is high bandwidth (it’s in writing, you can re-read, etc.), whereas phone is low latency (several back-and-forth explanations can happen in seconds). Each has its place.
If social anxiety is a factor, that’s a perfectly valid, but separate, issue.
https://projects.propublica.org/nonprofits/organizations/237395681
That claims ~$420k compensation with ~$25k “other.” If he is playing any substantial role in bringing in $100M+ funds for a good cause, I’d say this person’s compensation isn’t something I’m going to get worked up about. For VHCOL areas this is middle class household income (looks like they’re based in NY NY, so…VHCOL).