Generalising my experiences, prepared piste skiing is a fairly sanitised experience – few trees, cliffs, berms, jumps, and drops to crash into unless you venture off the runs. Of course there are the slips and tumbles, but truly serious incidents seem, more often than not, to involve collision with other skiers on the packed runs.
But they keep building more beds in the resorts which pumps more people into the same space, increasing the dangers. I’ve not been to Morzine, but I hope MTB does not become like this. But I suspect it will go the same way.
I managed a slow backward somersault, landing on my head, while snowboarding into a deep stream bed in Axamer Lizum a couple weeks ago. I was surprised but completely unharmed, landing in the soft snow.