That was still an issue, Jerry explained in his
interview with SFGate, because someone could compose an entire line of text, decide they didn’t want to say that anymore, and go with a simple “yes” instead. But the person on the other end, who’d already seen them write a bunch of asterisks and erase them, would go,
“That’s not what you wanted to say. What were you going to say?” It became clear how unnecessary all of that was, so they just decided on
“John is typing…” and called it a day.