the problem is not performance vs power usage, the problem is the cpu faults and the device reboots because they fucked up completely on engineering safe voltag

the problem is not performance vs power usage, the problem is the cpu faults and the device reboots because they fucked up completely on engineering safe voltage margin into the thing all cpu faults if undervolted. tipically the more the clock speed, the higher the voltage needed so that transistor keep working correctly. on a mobile device battery degradation is normal, with that comes less viable battery life but also a lower voltage when you put togheter the two things you just need to plan accordingly. that's what was the whole kerfuffle: they didn't it doesn't help that they use short lived batteries in iphones (go check it, ipads are rated twice the cycles) but the whole issue comes from bad engineering of the cpu/gpu or whatever they put into that doesn't work with the degrading battery output the device should have been built to cope with