Yes. My (very limited) experience with FDM and SLA printers was that re-creating a file from the source was at least two pieces of software and many minutes. I’m no expert so it’s possible that other toolchains are less ponderous.
This is exactly correct.
It has a great deal of onboard memory, but if you simply replayed what was in it, you might get the wrong focus, wrong location, wrong material settings, etc, depending on how similar the new piece of material was to the old one.