Having started riding on old Brit bikes, some that used more oil than petrol, I have always "blipped" the throttle as I go down the gears as this was the accepted way to make gear changes smoother.
My youngest daughter (15) has just started riding lessons in preparation for getting her licence when she is 16 and the instructor has told her not to do this as -
a) It confuses the bikes electronics
and
b) It is anti-social
My view is that she needs a different instructor!
What do you think?