Possibly because most are running the most current version of wireless shifting? How many times have you witnessed bike changes due to that or see riders banging their shoe against a stuck front derailleur? Couple that with debris stuck in disc brake calipers, etc and it's more than flat tires. It could even be sponsored tires that suck on slick pavement.Good question. He has already been confronted in the podcast. He says that it is very time-consuming. There he says also that they are in the process of developing new control processes, as the current processes do not rule out the possibility of motor doping being used. Those are his words.
But ultimately they can do what they want as they are the only body authorised to control the bikes.
It is inexplicable to me that there is so little and inadequate control. There is really only one question I have to ask myself. Are they really trying to find something or is it just to look like it fot the good image of the sport?
Above all, we must not forget that they only check 1 bike per rider, if at all. What about all the bike changes? Like the one from Pogacar at Roubaix, for example. Why did he change his bike at all? He didn't have a flat tyre. In general, we've seen a lot of bike changes in recent years where I, as an amateur, always ask myself how shitty these high-end racing bikes must be. I ride more than 10k a year and have a maximum of 2 punctures a year. How can it be that the professionals with better material change their bikes that often?
I've got cable shifting on my gravel bike and 13 speed, single ring Campy. Never a problem except sticky mud. It's rough here and few want to ride the newest stuff 'cause it's expensive to crash. The ProTour guys have no choice.