Lats, the only logical conclusion I can come too, and this again isn't based on a study, just reasoning.... is that test doesn't actually hinder collagen synthesis or your tendons, it just doesn't support similar growth as compared to the growth of muscular tissue. So it's not really harming directly it's just not supporting. As the muscle gets stronger quickly the tendons take far longer to catch up. Significant load over time would encourage the tendons to strengthen / thicken, but in the short duration of a cycle it can't compensate.
As for joints, unfortunately the stuff that makes up those ever important areas are no different than bushings in a car or mechanical lever. Unfortunately, there isn't a 30k mile swap for shoulder capsule and a 60k mile for hip. All we can do is try to support them by eating healthy and keeping appropriate mobility in the joints to prevent unnecessary grinding, lack of space to properly rotate, and not create shear angles during activity.
Thanks for your thoughts.