My observations have been that the guys that were fast and stayed fast as they got older seemed to be the ones that kept at it. That is, some variation on “use it or lose it.” So I’m not sure how limiting exposure plays into this. Seems to me that it is important to keep demanding elasticity in your training. On the other hand, I understand the need to match training loads to individual athlete. After all, you can’t continue to “use it” if you are injured!