Perhaps it should just be a binary; just buy it when your old one literally breaks, like literally doesn’t turn on anymore? Not when it is slow or whatever; and also not when it somehow, the new version has some sort of new feature function you were just dying to have. Even if the new future or the new function is insanely good… That is still a “via positiva” thing — we innovators, we are not suckers. We know that true innovation is removing and getting rid of and cutting out things and subtracting things ,,, not “adding” them!