Exactly!
Am I wrong or did I read somewhere that CS3 was optimized for Leopard?
It is optimized for the "Core Duo/Quad platform". Leopard is similarly optimized for same.
64 bit, multi-processor centric, etc.
If Apple changes processor suppliers again we have to wait 2 YEARS to get software for it AGAIN. The good news is Intel has announced its next 2-3 die shrinks are going to use similar instruction sets (with supersets introduced each time). Further it has announced its next two die shrinks have become technically feasible already. Good news. After that 4-6 year cycle plays out, the next processor family has not presented itself yet.
Rocketman