Brief thought exercise: why are people generally more receptive to "let's hop on a call" or "let's schedule a meeting" then a three-line e-mail that explains the situation?

I've wondered this constantly in different jobs I've had, and even aspects of the job search. You can write a pretty short, to-the-point e-mail that explains your situation or a project's situation and one of the first series of responses you get is "Great, let's schedule a meeting" or "Let's schedule a phone call." OK, but ... the e-mail just talked ab…