Maybe I'm reading this wrong but IMHO your response appears to say:
"I am famous - no one in my field doesn't know who I am.
Things are different for you unknowns.
I can verify identity and character through text and email, because of my fame. "
Do you know what gender I am? You might assume I'm male (and you'd be correct) but you have no proof. When I contact someone via email or text, I have the same lack of proof that I am corresponding with the person that I believe I am hiring. I'm not sure how being a luminary like yourself changes that.
In pro-am, or ama, you work with unknown and/or newbie models sometimes. In some cases they are so clueless that they wouldn't even know a VIP like yourself. These newbies and unknowns may not have actually decided independently and fully to enter this field - they may have a "manager/BF" or "agent" who is pushing them. These guys may post ads, answer emails, texts, etc. They may agree to shoots, ask for funds, etc, then, when the shoot happens, the models either a. flake (costly) or b. Say they weren't told about or didn't agree to X (costly and risky) or c. Show upon set with "Manager/BF" (drama)
A simple phone call fixes all that. Mitigates risk. Increases productivity. Reduces stress. Maybe fame does all that stuff too, but, as you point out, I wouldn't know.
I also see at least 10 other responses that agree that a call is a good thing. NaughtyRob, Duke, Paul Markham - these are well known folks - hell Paul was on Reddit

. Maybe fame means you don't have to explain yourself. David Bowie will explain fame for us: