Good questions asked of Bosch. Interesting replies.
The throttle topic is rarely an issue where customers say they don't want one. The only time they don't want one is when they are concerned about regulations. So it's purely a regulatory issue where people who legislate decide no throttle somehow makes the ebike safer. What they don't realize is an ebike is slower in throttle only mode, as the motor is doing all the work, and it really wasnt meant for that. The motors and battery capacities on ebikes are designed for 'assisting' the human. Imagine what that actually means.
I have heard that here in the US, Bosch actually lobbies to ban throttles completely. So if that's true, don't expect them to say publicly they will ever offer a throttle. Yamaha is the same way in that they refuse to offer a throttle.