I'm pretty sure it's because it's a sort of "fake" HDR where it's just choosing bits of the image that are over or under exposed and comping/overlaying an area of an exposure that is correctly exposed.
As opposed to a "real" high dynamic range image which is made by combining data from multiple exposures into an image with a higher bit depth. That resulting image is then usually tonemapped so that the extended exposure data is compressed into a smaller range and is viewable on a monitor at ~8 bits per channel.
Tonemapping is what people are usually referring to when they say they don't like HDRs, after all, who wouldn't want more range
