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A lot of “nevers” in that post. And frankly they’re all BS. Knees are just a bad design. They get hurt ALL THE TIME. All you’ve got to do is twist wrong ONCE and your knee is jacked for life. My bad knee started sitting wrong in a car on a cross country trip. It’s never been clean sense, exercise can make it so it doesn’t hurt a lot, but there’s always the threat. And back when I did a lot of walking I learned knee problems are contagious, you walk funny with a bad knee, and that bad walking puts added stress on the other knee and in relatively short order you have two bad knees. And bad hips, how you walk on bad knees jacks up your hips too. Swimming still causes problems. Ear infections (which aren’t actually infections). If you do a lot of under water swimming it can play hell on your inner ear. And if you kick off from the walls a lot it can mess up your knees, so the no knee strain idea is bogus, it’s at best avoidable knee strain. And of course you’ve got all that time in the sun. Tell Tiger’s back surgeon about how wonderful golf is. Heck tell any of the guys on the senior tour with those elongated putters. Golf is hell on the back. The fact is pushing the body ALWAYS incurs wear and tear and that ALWAYS leads to problems. If you’re going to perform at maximum effort at anything it’s when not if you get hurt.

Well, I have a master's degree in this field and taught for 27 years at a college and saw ALL kinds of problems with athletes and ordinary folks from 18-70 years of age.
But, truly, it sounds to me like your problems might have reached above the neck. Your reasoning is as clear as gnat droppings in pepper.