That seems like a small thing that I as a users of lenses would see as a benefit (more folks who could fix my lenses) even if I don't have the inclination to do

That seems like a small thing that I as a users of lenses would see as a benefit (more folks who could fix my lenses) even if I don't have the inclination to do it myself. Wonder why manufacturers don't do this? (The majors seem pretty hostile to their user base, but smaller companies like Sigma you would think might care more?)