Making any reference to Zwift here is in my opinion a bit misplaced. But OK.
P.S. One thing i forgot to mention in regards to this stage is to commend the organizer. For filling the holes on the descent from Croix de Coeur with some asphalt. That alone likely prevented a couple of crashes from occurring.
Ignore the throwaway line about Zwift at the end, then.
You still haven't substantiated any of your fears about doing the first 124 km of this stage.
Given the road conditions on San Bernardino, is your prediction of "Massive crash, a lot of smaller scale crashes, GC favorite(s) abandoning" any more likely to have happened then than at any other point in any other stage? Your justification for cancelling much of the route seems to be based on imagining that the worst that could happen would happen, and would happen in that particular place. If you adopt that mindset, then every kilometre of every road race should be cancelled, because crashes can be imagined anywhere.
Please address that issue.
Yes, there are some roads that would be inherently much more unsafe: that's why we don't see precipitous descents on gravel or ice. But that does not apply to the well maintained surfaces of San Bernardo in clear dry weather, such as was forecasted, and seen, last Friday.