In June 2008 Apple announced Mac OS X Snow Leopard, proudly boasting that it would have "no new features". Instead of piling on new things, Snow Leopard aimed to build on the success of its predecessor, Leopard, opting to focus on under-the-hood performance and stability improvements throughout the system.
I really wish they would stop the yearly updates, iOS as well. Just as I get the current version figured out it is time to update and learn new stuff.