Imagine taking your car in for an oil change annually and the radio stopped working when you got it back. It's incompatible with the new oil, they say. You'd be furious.
With the Windows of yore this wasn't so much of an issue — with 5-10 years between upgrade cycles — and service packs in between — you could space it out.
When you work in the computer industry, there tends to be a disconnect with how they are used in the real world by real people — as tools. People grow accustomed to their tools and expect them to be reliable as opposed to some ephemeral service.
