I think it's done without thinking for older bikers who needed to be mechanically sympathetic.
I do it without thinking but WASH your mouth out "OLD".
Well speaking for myself I thought this was an odd thread as blipping the throttle just comes naturally for me and is done without thinking. However in recent years I do come across younger riders that just smash their way down through the box and this would be on something without a slipper clutch. Quite possibly modern engineering negates what I'd call mechanical sympathy, but that's all I know.If someone's asking why or how down shifts are assisted with a blip of throttle I'd have to assume they were quite young or new to biking.
I have to agree with Robbo, I don't know how you could make progress ( go fast ) without blipping, if you just change down the bike slows and then you at the wrong part of the rev range to exit the corner briskly. I sort of don't really understand this post if I am honest. its like asking how to ride a bike really. don't wanna be rude .
Show me where blipping is taught in the motorcycle test!
I am not a fast rider and use the mantra slow in fast out but it has never bothered me not blipping, however every day is a school day.
If you bothered to read my original post i asked the question why do it, if the engine matches the revs to wheel speed when changing down, wind on the throttle and you negate the engine braking. However as Val explained that is not what happens. Sorry my lack of technical expertise lead me to ask a question on a forum designed to help everyone!