The other day I went back to the crag where I learned to sport climb in the early 00s, a small but brilliant granite crag a stone's throw south of the polar circle. I had a kneepad with me because it is 2022 and not 1994. I couldn't be bothered to put it on since it was warm and I didn't care if I topped out any of the routes or not.
When I first started to climb there around the turn of the century, I made my first kneepad following some instructions in Climbing Magazine, since it was pretty obvious that it would help. As time progressed, I bought and used the first kneepads commercially available in Sweden (5.10). When I moved away for good some ten years ago, I knew most of the routes at the crag well.
Now, when revisiting the place, I discovered that I could take both hands off using knee bars in a lot more places than I could 15 years ago. In some spots that I previously could only get some marginal knee bars, requiring at least one hand on, and only if wearing a rubber knee pad, I could now take completely bomber no hands rest wearing slippery stretch jeans and no pad.
Just like tape glows allow for faster learning of handjamming by making jams a lot less painful, it seems like my constant kneebaring on Mediterranean limestone wearing protection against the rough rock actually do improve the technique. Who could have known?
I am not sure I have a point other than it helps a lot to move to somewhere with lots of kneebars, buy kneepads, and try to put them in everywhere.
You might get weak.