[can16358p]

I'm just speculating but the accuracy needed for Pencil to work properly is, by nature of the application, much higher than estimating ink in cartgridges.

I mean, if cartgridges' calibration drift a bit it might also be more acceptable for many, but if Pencil starts drawing incorrectly many artists would be extremely frustrated and move away from the ecosystem.

[userbinator]

The fact that they showed how using the controller chip from the existing screen causes it to start working correctly shows definitively that this is not about calibration at all.

[Shadowmist]

Unless the calibration data is stored on the controller chip.

[jprete]

But the physical screen is a different screen so any such data is totally wrong.