I wonder how this simple interface -- which looks awesome! -- integrates with the complexity of Mac OS X, both the good (unixy bottom layers) and bad (long star

I wonder how this simple interface -- which looks awesome! -- integrates with the complexity of Mac OS X, both the good (unixy bottom layers) and bad (long start-up time, error-prone interactions between drivers, network services, etc.). In other words, is it an iPad with the start-up time of a Mac, that sometimes pegs my CPU collecting file-system metadata? Or a Mac with less BSD and more iOS? Hopefully neither. Another question -- is there a "low end" in Apple's world? Are they building an ecosystem that cheap PCs won't be able to participate in? What about old Macs? It would be ironic if my parents had to buy a fancy new 64-bit Mac in order to have a more iPad-like experience when they share photos with me.