>He wouldn't have done that if whatever he needed to say could've been said over email.
No, this is likely not the reason in this particular case. If email were a replacement for face to fact negotiation, sales people would have stopped taking flights 25 years. Instead, sales at the b2b level is still filled with travel and relationship building.
Humans like humans showing up in person and to blow smoke up their ass. They don’t say that but it’s what they really like and they respond to it in the form of being less ruthless when it comes to cutting ties, etc.