Thank you very much for your replies!

Now as I am owner of BitBox02 I have also some little experience with subject.

Here is my report:

1. Yes, I was able to learn and train how to use the non-existing buttons.

2. But it happened for a while (at the very beginning of set up) that those non-existent buttons didn't work properly themselves and it didn't depend on how good or bad I was in tapping. They sometimes didn't feel tapping and they sometimes  reacted wrong way.
Then I calibrated the device according to manufacturer's troubleshooting.
The calibration didn't help.
I continued using device anyway, though it was very inconvenient and tapping took a lot of time to get desired result.
After a while buttons started working properly.