No problem. They said this early on. I forget where.
Most other laser companies give a list of “Suggested Settings” for some materials. However, they always have the caveat that the settings might not work and testing is required. They have no guarantee that the material will come out nice or how you want it.
Glowforge decided to make Proofgrade instead, where they control the quality and provide settings that they can guarantee you will get a good cut/engraving every time. However, they will not guarantee that a non-Proofgrade maple plywood (for example) will cut the same as a Proofgrade maple plywood. They are similar, but the non-Proofgrade might use non-laser compatible glue or have interior knots or something. You will need to experiment if you want to find out if it works.
The good news is people here have cut all kinds of weird things (I’m looking at you @henryhbk and @Jules). If you have any questions, we’ll gladly help out. @jamesdhatch already posted a Cut Calibration Template in the Free Laser Designs section.
Also, this is a pretty nice material template from Thingiverse. You will waste more material with that, though.