I guess "tolerable" is a subjective opinion in the eye of the beholder. And there certainly wasn't any benefit to IOS 8 to justify losing 25% of my unit's productivity. I'm sure that's OK for some and they can stick with Apple. It's not OK for me and I'll go elsewhere. To each his own.
“THAT” is simply the nature of “technology” and “Moore’s Law”. It hasn’t changed since computers were invented, and it applies to all companies.
Moore’s Law
http://en.wikipedia.org/wiki/Moore%27s_law