To be honest, I'm quite thankful to whomever decided this. If it were the other way around and everyone used px but it represented true pixels, there's no doubt developers would be incorrectly designing interfaces across the board and websites looking totally off would be a common occurance due to you having an hdpi display or not having one (like what frequently happens with x based apps in Linux).

As an aside, technically, yes, it may have been better to converge on some more clearly "fake" unit rather than calling it a pixel but for me that's a nit pick.