It isn't and it's not. The procedure reduces to 'shift multiple sprockets.' The reason for it, again, is that the chain doesn't reach full tension for a given sprocket until after the shift is completed. In the initiating stage, there has to be enough B-screw to prevent rub, and the amount differs with how many sprockets you want to shift at once.

Interference doesn't require an 'oddly-stepped' cassette, though there are plenty of variants that make it more probable. SRAM in particular often eschews even jumps in favor of larger ones moving into the big sprockets. I can't speak to the nuances of their (or Campagnolo's) road derailleurs.