Never going to happen. Apple is not a customization friendly company. That's the whole point behind their design principles. If you don't like it, switch to MS or Linux which can provide you all the customization options you want but I can assure you 90% of Windows or Linux people don't customize their stuff even if they have the ability to. Most often than not the customizations do more harm than good due to the fact that it's not easy to customize anything and often break stuff.
Snow Leopard was not just a performance update.
It was a major core modernization for an OS core that was reaching a decade old. This can not be emphasized enough to show how hard it is to do that in any OS and we should be glad that it did not take more than two years to complete. It was not suppose to bring any new features, so you can't compare it to Leopard or Tiger either. Grand Central and OpenCL are not something you can "pad" on any OS, it requires a significant amount of changes to the core in order to work well. It'll also take a few years for many developers to start taking advantage of those features. There are hundreds of thousands of changes in the core that none of us can see, feel but will experience in later releases of OS and the new generation of 10.6+ applications.
The applications are not part of the core development teams, they are being constantly updated by the respective teams that works in alignment with the core team.
"a self-serving update on Apples part they basically had us pay for them to clean up their own house, not that I mind it was priced low enough and they did release it before doing another update focused on new features."
Would you rather wait 5-8 years instead?