You may be right in some of your points but I didn't explain. I don't ride bike like a racer since many yrs ago. Of course cannot hit 140km/h and down 2/3 gear to bring down to 50km/h within 2-3 secs. I am talking about 100 to 80 to 50 slowly in normal rides. Always ride in the correct gear matching road speed.
Yes. I do tap front brake switch sometimes. I do use all 3 methods. Down gear to slow down. Another gear, another gear and finally use brake if come to complete stop.