I totally agree with you that bands should not be used for more than 2-3 weeks consecutively when used to increase loading in the eccentric phase of a lift. I personally don't like to use them for more than one training session per week during that 2-3 week block. I have also used them on a bi-weekly basis for up to a 6 to 8 week training period. That's a very good observation regarding bands being even less forgiving to older lifters due to the loss a elasticity in our tendons as we age. Last Wednesday's workout is the first time I've incorporated bands eccentrically in my training since my shoulder surgeries. I've just been too wary of including them before now but feel I'm ready to start placing the extra stress on the repaired tendons to thicken and make them stronger. I'll admit that I had a lot of apprehension in adding them but everything went well so I'll probably start cycling them in and out of my workouts again. I have no issues with using chains on a much more frequent or daily training basis.