claims that ATRAC was inferior to MP3 which is lie.
No it's not (at least for the original ATRAC - the later versions were better, but pre-recorded minidiscs couldn't use them for compatibility reasons). The original ATRAC was horribly crude and threw away a load of frequency ranges before doing some fairly naive compression. I was at a lecture on digital compression techniques a couple of years after MiniDisc came out. The person giving the talk made us listen to both and the CD source without telling us which was which. Most people in the audience couldn't tell the MP3 from the CD but almost everyone could spot the ATRAC recording. Looking at the frequency curves of the two later in the lecture, it was pretty obvious why.
I completely agree with the grandparent on MD-Data though. In 1997, MD-Data could store as much as a CD on a cheap rewritable medium. If they'd licensed the player designs, you'd probably have seen MD replace floppy disks, especially in laptops and I doubt CD-Rs would have become nearly as popular as they did.