I see your point, but "retina" is just a simple stand-in for "pixels so dense individual pixels are no longer distinguishable". It doesn't seem like the author

I see your point, but "retina" is just a simple stand-in for "pixels so dense individual pixels are no longer distinguishable". It doesn't seem like the author was saying 'just apple devices' -- it's simply a convenient way to reference that class of displays. Once more displays come out with extremely high pixel density, we'll probably have an industry wide name for it.