If the goal was to increase product longevity why did Apple only admit this wonderful measure only after it was proven by a 3rd party? If this was such an altr

If the goal was to increase product longevity why did Apple only admit this wonderful measure only after it was proven by a 3rd party? If this was such an altruistic measure why would the geniuses at the Genius Bar deny that my mothers phone had slowed down and throw diagnostic tests at our faces? Why was the exasperated Genius, who could clearly tell that the phone was slow indeed but his successful diagnostics meant there was nothing he can do, reduced to swiping up all the apps on the phone to kill them, when we both knew that if iOS was working properly that should do nothing?