At least, this one is well remembered :)
The usual debate surrounding the original DRAGON isn't as interesting as what this monster did represent in 1983 : it was the most one could do without actually altering the Compact Cassette format's physical structure like the ELCASET did (ie. open-reel in a cassette) or Luxman's X-3K prototype should have done by completely pulling the tape out of the cassette's shell thus removing any rotating movements from the tape.
Really pushing the format to the limit and selling quite well, the DRAGON became the one show-stopper until cassettes got replaced by digital tapes, recordable CD and, ultimately, hard-drives and SSDs.
Marantz/Philips used its own MAAC split-track auto-azimuth control in the 1983 SD-930 : same concept but a very different implementation, perhaps more rational. The actual licensing of NAAC/MAAC may therefore have been also split or come from elsewhere...
This probably worked and despite its near 2000$ pricing, Nakamichi sold many many many Dragons throughout the world until the very late 1980 and as late as 1994 in Japan.
Even if Nak' did make better decks later on, the DRAGON is the one that stood out.
It still does - but I really wonder why the Etsuro brothers never made a full-tilt open-reel recorder beyond their mid 1960s Fidela and GemSonic attempts...