That sounds like the existing Magic Keyboard for the current iPad airs and pros, can you explain the difference a bit more?
I think they just don't know about the Magic Keyboard.
You would be correct. If the ipad let you use full osx it would be pretty attractive to me and I probably would have spent the 5 minutes needed to discover the magic keyboard, but unfortunately the idea of buying a computing device with such insanely powerful hardware but being locked into standard tablet UX really doesn't excite me.
i bought a magic keyboard for my 11" ipad pro and ultimately didn't use it much. it does have a traditional laptop-style hinge, but the way the ipad mounts to the case brings it forward over the keyboard more than with a regular laptop. the hinge also doesn't allow for a very wide range of motion (even compared to macbooks). finally, the center of gravity is really high compared to a laptop which makes it awkward to use as a literal laptop or when lying down.
it definitely looks cool (i could see the design having been inspired by the OG Mac and 20th Anniversary Mac) but works best on a stable surface; plus if you want to use it purely as a tablet, you're left with a big clunky keyboard case to deal with.
the idea of a laptop/tablet combo is cool but i haven't seen the concept executed very successfully from either starting point.
the point of that hinge, besides weight distribution, is to make it easy to reach and touch the bottom of the screen, and so that it's not fully perpendicular to your finger.