[sdhgaiojfsa]

My iPhone has been through three major OS releases. My MacBook has been through two, and the previous one survived three. However you came to your current beliefs, I don't think there is good data to support them. Apple is quite good about OS upgrades in general.

[rusk]

I don't think my iPhone was ever damaged by an update - I always migrated to a newer one before the newer OSes caused strain. I was one of those who held off on the initial releases of iOS 7 ..

But my god Yosemite in 2015 (again waited for it to "stabilise") on my 2014 MBP was an unholy shitshow.