According to Greg Kroah Hartman on his presentation at Google Tech Talk earlier this month, kernel 2.6.25 achieved higher statistics compared to other releases. With that rapid changes, no wonder the changes are so inevitable. Because of the same reason, some bugs might slipped the development process, thus -Stable kernels are released to fix them.
This morning, i upgraded to 18.104.22.168, and tonight i saw a new release of 22.214.171.124 which fix couple of bug fixes (some of them are x86 which could applies to my system). It's just another proof that Linux Kernel project is one of the fastest project available on earth. Bugs are squashed at fast rate, meaning less vulnerability system for public servers.