Is manually upsetting based on trusting the accuracy of the release notes any more secure than just trusting “latest”?

Yes, that’s what I said. They wrote another test program, with a correct implementation of IsPrime in order to test to make sure the pictured one produced the expected output.

My favorite part of this is that they test it up to 99999 and we see that it fails for 99991, so that means somewhere in the test they actually implemented a properly working function.

Easy solution. Sell a separate “motion platform” and an “FDM module” as distinct products that basically snap together.