Kernel upgrades?

[Heinz Diehl]

On 23.08.2011, Stephen Gallagher wrote: 

> Just to provide a more complete answer: the issue with trying to use a
> 3.x kernel on Fedora 14 (or Fedora 15) is that a large number of
> applications and kernel models are designed to expect the 2.x version
> number. They fail to parse the 3.x version and will not run properly.

I have never used any distribution kernel besides the installation process itself.
I'm running both the latest -stable and -mainline on my F15 machine without any problems.

So what's the problem with a 3.x version in detail?