This isn't a tautology. Plenty of hardware is in the set of hardware officially supported by manufacturer or oem under Linux or known to be well supported by op

This isn't a tautology. Plenty of hardware is in the set of hardware officially supported by manufacturer or oem under Linux or known to be well supported by open source drivers. If offical data is absent unoffocial data is oft readily available. If nothing would lead a reasonable person to believe it is supported then your default assumption should be that is likely not. If the functionality that one expects to work works as expected on supported hardware but not on yours then Linux isn't broken your hardware is. If it doesn't work on previously supported or otherwise well supported hardware its a bug in the software. It's weird that compatibly is discussed as if for the next 20 years one shall be forced to use a succession of randomly chosen machines and compatibility will ever be a crapshoot. Often people will initially try Linux on random machines but official Linux machines are out there and those who have decided that Linux meets their needs can easily find well supported hardware.