Yes, good hints, but you are spot on. Inspection.
I check at so many steps. one of the things I learned early on was to prime and only when primed do I expand. I process in huge masses, a stage at a time. so ever batch is primed and checked. Then they are expanded only after checking, and again eyeballed as I load them into the blocks. After charging and inspecting the blocks to make sure every cartridge has a charge, I once again look as I set in bullets and seat.
Even at the very last stage, at least in theory, I should never push a bullet into an umprimed case, since there will be no expanded cases available that aren't primed.
Point is that I do all of my loading single stage, and that is where I believe that people are at greatest risk of error. letting a round slip through the process. So on single stage, I believe that redundant inspection is absolutely necessary.
one of the benefits of priming before expanding, occasionally a primer pocket that is stretched will still feel good as you prime, and go unnoticed. The compressed air when the expander slides in can blow it out. I have had that happen a time or two.