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I hear you and no doubt you're right but on my commute what @NickCJ points out tends to be the norm. Watching cyclists skateboard awkwardly up the left of cars/bikes/trucks in desperate hope of getting to the ASL before the lights change is painful to watch and more importantly looks like it's putting them in a potentially dangerous situation.
I guess my point was IME motorbikes blocking potential routes to the ASL neither has any affect on my commute time or my safety but some people seem to take real exception to it and make a point of getting past at all costs.
That's what the ASL is for, Motorcyclists should really get in line with other traffic to wait for lights, not at the front or to the right. The ASL is there for the safety of the slowest "traffic" ie cyclists, not the quickest, motorcyclists.