call this a shower thought; but I was setting up a recent job and tweaking some focus distance dimensions and I realized that the camera and more specifically the camera compensation has made glowforge users way more concerned about focus than we need to be.
Because that number drives how accurate your positioning is I have been very concerned about it most times I run a job; but as I was running this job (a wooden spoon in a jig, hard to measure) I looked at the range of focus distance that it was covering with a single focus point and realized my focus number really wasn’t super important. unless I am doing really small details like 5pt font 20 or even 50 thou doesn’t really matter; I still got nice sharp lines over 1/8" focus range