There are resources out there to learn exactly what’s going on, and the process is not too complex.
I’ve recovered a bunch of nuked MBR records and broken boot partitions myself, and maybe things UEFI added some complexity, but it’s not hard if you have a live USB ready and know the appropriate conjurations.
Most of the fun comes from self centered arrogant companies that make monocultural software, blatantly ignoring that other OSs may already be installed.