I understand multipass function and keeping the focal depth for engraving multipass makes perfect sense. But with cutting a 2 pass should make the second pass focal depth half way to zero. Similarly a 3 pass should make a cut and third increments of focal depth. Doing this manually with additional layers is tedious and there would be no case in which is would not make sense to have the software do the math.
Example: 3 pass cut on .25" oak
- Cut 1 at .25" focus
- Cut 2 at .16.666" focus
- Cut 3 at .833 focus
Example: 2 pass cut on 1/8" acrylic
- Cut 1 at .125" focus
- Cut 2 at .0625" focus
For scoring and engraving the focus would of course remain the same, but it just makes sense and cleaner cuts for cutting to have the software do this adjustment toward the zero depth of the full cut as it makes additional passes.