[Cam]

I've wondered about the "slip when you shift" mandate to protect the driveline. When the shift is made the shock load instantly goes through the driveline. The additional load of the higher gear then pulls the engine down, reducing certrifugal clamping force on the clutch and it slips.
By the time the clutch slips any damage has already been done. Setting up the clutch to slip in the shift seems to be after the fact. If it's slipping a bit to keep the engine from falling below it's power band thats a different story.
Cam