I think Shaggy and I are of a similar outlook. It's not skill that's being questioned, rather risk. In other words, the 'ballerina' is risking a few bruises and a couple broken bones. The 1st video, on the other hand, the rider is risking much, much, much more.
I'm an autocrosser. I'm pretty good at it. But, there is little risk. The 'initiation fee' becomes 'manageable to the masses' when consequences are reduced to inconveniences.
The discipline is worlds apart.