I agree about transponders, but can it be that easy for all tracks to have this technology? If it can then let's get rid of the tapes as there is no need for them if we can work off lights. As you say none of the sports you mention have tapes, so Speedway could resign them to history.
TBH I just get sick of the restarts and letting riders move at the start may in some part equalise the bad gates. A bad draw in some GPs can spell the end of a riders chance and that can't be right either.