Were EB guitars the first bolt on guitars to have a sculpted heel?
Fender did it on some of the Richie Sambora guitars, though I am not sure of the timeline.
The contoured neck joint is one of the defining EBMM features for me. Most comfortable neck joint you'll ever find on a bolt-on guitar. Peavey ripped this off too on the Wolfgang (though not exactly the same).
The Fender contour is just a regular heel joint w/ a diagonal piece shaved off, it's not a nice, round heel all around like on an EBMM.
BTW, I vaguely remember a 27 or 31 fret guitar with some wild heel design - sorta like Nuno's N4's. It might've been Washburn. I'm vaguely seeing some red 80's type crackly finish and that outrageous, diagonally cut fingboard end with really tiny frets.