I agree that a ban doesn’t make sense, but even “ephemeral” injuries routinely generate significant costs.
(In my experience, musculoskeletal injuries are rarely completely ephemeral, they tend to have long-term effects, even if minor.)
My point is, most injuries aren’t ephemeral in the sense that your body would end up as if you didn’t have the injury in the first place. In particular the sports injuries we are talking about. You may only truly realize that a decade later or so. So I find making that distinction questionable, it trivializes the injuries.
As I said, I agree that bans don’t make sense. But the costs are real, and therefore one should take care to avoid injuries instead of trivializing them.
I'm gonna call that sample bias. If you exclude all injuries that are ephemeral, (because they don't get reported, because they're ephemeral, and forgotten), you're left with the injuries that aren't ephemeral. I mean duh, obviously lol. But my point is still, yes injuries are bad, and as a society, we're pretty trash at healing them, but injuries are more impactful for the individual, than for society.
And bonus point; if we're talking about sociatial responsabilities, given injuries are unavoidable, shouldn't we be trying to fix our responses to them rather than trying to limit people from enjoying life? Mountain biking in fun, so are trampolines. Strictly speaking, the world where we've solved injuries (think any sci-fi pantopia) is better than the world where we didn't because we just outlawed getting injured.