I thought it worked fine with devices that had never been updated because you start from the very oldest spec and the lowest power and then both devices have to

I thought it worked fine with devices that had never been updated because you start from the very oldest spec and the lowest power and then both devices have to negotiate up? I mean, sure you won't get better performance or power out of an old device but it's at least safe which is good enough for me, and for bonus points it's likely to work at some reduced level.