[robotastronaut]

Anecdotes follow:

As a lifelong soccer player, my knees are in terrible shape. I have multiple meniscus tears in each, and I've also had catastrophic injuries in both ankles. Despite that, I keep playing. The most useful teammates I have are those players who are also running fanatics. They put a lot of effort into gear, technique, and ritual that helps prevent and repair knee and foot damage. I've not encountered this much devotion to bodily integrity in any other sort of athlete.

[SketchySeaBeast]

Soccer is a totally different game than running - it's basically a game of "how to best apply extreme forces to your lower body in unstable positions". You're twisting and turning and applying force in ways the body wasn't meant to handle in any sort of repeated manner. I can definitely see how running would help - it'll help build up the muscles and surrounding tissue, but really, when it comes to longevity of the joints, soccer is just bad news.