Actually, if you run with proper form you will never injure your joints. That is easy when you are young. But as we age it becomes harder as we continue to run with more frequent soft tissue injuries and that creates imbalances. The imbalances are what create the joint damage.I've bilateral torn meniscuses at (almost) 50 - so running is a real chore, it literally hurts the entire time. Actually, rucking and walking does, too, but they're far more tolerable.
I've become a bit of a proselytizer regarding rucking - the number of people my age who continue to abuse their joints by running saddens me. Yeah, rucking takes longer, but the benefits are far greater - and I'll likely be rucking far longer than my running friends can still run...
I have never suffered a joint injury from running, and I run anywhere from 1k-2k miles per year (1515 in 2021). I have been running that kind of mileage for 30 years.
That said, our joints wear over time and even a man who loves running can see that I need to cut back and I am looking into rucking to pick up the slack (I hate biking, and it is not safe at all up here). My problem - I am not willing to drop nearly $1k on equipment. The ruck, weights, boots, etc. I have priced it out, and it is expensive when added to the ongoing cost of my running gear.