Complete speculation. But I was looking at Shake, and the requirements for it (which seem pretty high)
System Requirements
Macintosh system requirements
_ 800MHz Power PC G4 processor
_ Mac OS X v10.2 or later
_ QuickTime 5.0.4 or later
_ 256MB of RAM
_ 1GB disk space for caching and temporary files
_ Graphics card with 32MB of video memory and OpenGL hardware acceleration, such as the NVIDIA GeForce2 MX or GeForce4 MX or the ATI Radeon 7500
_ Display with 1280-by-1024-pixel resolution and 24-bit color
_ Three-button mouse
Three button mouse...now, wouldnt apple want to have a mouse thats a requirement for its own software?
System Requirements
Macintosh system requirements
_ 800MHz Power PC G4 processor
_ Mac OS X v10.2 or later
_ QuickTime 5.0.4 or later
_ 256MB of RAM
_ 1GB disk space for caching and temporary files
_ Graphics card with 32MB of video memory and OpenGL hardware acceleration, such as the NVIDIA GeForce2 MX or GeForce4 MX or the ATI Radeon 7500
_ Display with 1280-by-1024-pixel resolution and 24-bit color
_ Three-button mouse
Three button mouse...now, wouldnt apple want to have a mouse thats a requirement for its own software?