It's easier, faster, and more natural to talk than to type for the vast, vast majority of people.

This trivial fact of life is observed every day by e.g.:

- students taking notes and finding it necessary to only jot down key facts so that they can keep up,

- stenographers who require special training and equipment to keep up verbatim with live speech in the courtroom,

- annoying colleagues who insist on "hopping on a quick call" or arranging big, wasteful, and disruptive meetings instead of just writing down their problem / sending a message or email,

- friends who insist on sending short voice messages in DMs instead of typing, because it's more "personal" that way (which to be fair it is, but not to the extent proclaimed).