I’m imagining sports would be a lot more brutal if once a player got injured, they send out “the vet” onto the field to destroy them if they got any broken fingers or toes.

It's doomed as in they'll die with most bad leg injuries. Horses cant support themselves on 3 legs. They're just too big. There was a foal with 3 legs that lived for a couple years and made its round on social media, but it was eventually put down because it just grew too large. Poor thing should have been put down immediately because the life it lived was of terrible quality despite getting specialized care.

I've seen a few horses get put down for a bad leg injury. Almost had to put down my childhood mare after she fucked up her leg in a fence. She made a full recovery, but it took almost a year for it to heal. Her leg got caught in the wire fence and it got shredded to the bone. It was awful, but she was able to stand on it enough to keep herself upright and all that, so we decided to try to get it healed and were miraculously successful

You'd probably notice it more if you were doing sports with a lot of lateral movements, pivoting, and changing direction. Not so much with something like cycling. You might notice over time it if you were doing something like marathons as it does help absorb some ground force reaction on heel strike.

The radius moves a lot more than the fibula, which makes sense considering the need for moderate rigidity for weight bearing. The fibula only moves around a degree in internal and external rotation and less than a degree in the sagital tilting.

If you think about the rom in the ankle compared to the wrist it makes a bit more sense.

You'd probably eventually notice just after a long time if you are fairly active, even a loss of rom of a couple degrees adds up over time. You would probably notice a lot faster if you were an athlete, just because the issues would compound faster and you're more connected to your body.