Many people will not be able to return their hardware if it does not
work with anything else than one operating system and the manufacturer
did not clearly state that; or a BIOS upgrade cripples all installed
OSes except for one. Legal counsel would be helpful, even if it just
consists of publicly given instructions. The BIOS upgrade case
potentially can be intentional damage to already purchased hardware,
or whatever the lawyers call that.

At least these were the thoughts that passed through my head when I was
choosing to buy some piece of dont-know-what with Win 8 logo,
and it also pushed me many years back to times when I was checking
if the hardware has linux drivers at all.