My company supplies a headset in the aircraft, but I bring my own, thank you very much. I have no desire to get infected with herpegonasyphillaids that the last guy smeared alll over the headset.
If you on priniple expect the company to supply the individual with all necessary equipment for the job, where is the line drawn? Headest, ok. Flashlight? Sunglasses? Suitcase? Socks? Condoms? If I have to touch it, I'll have my own which I know is clean, fits, functions, and is of the requisite quality.