To be sure. many many things can go wrong. Like any other manoeuvre, allowance must be made for them.
Nonetheless (an I am NZ motorcycling's Nana of Nanas) I do overtake quite often in corners. Usually cages, but there have been odd occasions when it's been a bike.
The problem with "wait until the straights" is that there is a certain breed of driver (and, more rarely, rider), who will crawl tediously through the windy bits, but as soon as a straight is reached , his foot goes down (or gauntlet goes round) and he takes off as fast as he can. And often they are driving quite powerful cars (or riding quite powerful bikes) , so that overtaking them on the straights is a difficult (and most illegal) thing. Especially if one happens to be riding a lowly powered 250, or chookchaser. Or a huge tourer. And so it goes, creep frustratingly through the corners, watch him blast off into the distance (gee he can go fast in a straight line), and catch up at the next windy bit for more frustrating tail end charley duty.
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