I’d imagine that the injuries sustained by the average WT rider during a season of road race crashes are far and away worse than that vast majority of injuries picked up in xc MTB racing!!!!
Maybe, although I’d hazard that there are more road riders than XC that anyone would have heard of, the entire XC field bar the podium could be wiped out by a wayward gazelle at the SA round and I’d probably not notice, but I’d maybe know the name of some domestique from a WT team if he broke his collarbone on the cobbles.
And with the exception of Sagan, not many road riders would have the marketing pull to sell enough XC bikes after a weekends racing to justify the added risk of them having to sit out the rest of the season (and effectively have a sprint team coasting round the world tours without a sprinter costing millions).