MacBook Air is a rip off of the magnesium Sony VAIO superslim from 1998.
Actually had one of those.
Looked cute (I got seduced). Expensive. Poor keyboard, poor battery life, had to carry a dock around to connect stuff... hmmm - that sounds familiar :->
...except with the Sony the dock and external drives were included...
and it had a detachable battery!
But seriously - that thing was tiny (even c.f. an Air) it was
very underpowered (even relative to its contemporaries) the keyboard
was cramped (although ISTR the feel was OK) and the screen was small. The real downfall was, in 1998, you
needed the CD drive, the floppy drive (and probably a ruddy Zip drive as well). It did have built-in USB ports - but this was 1998 and USB was only just taking off so you did need and the dock with the parallel port etc.
The thing that set the Air (and subsequent 'ultrabooks') apart from other ultra-portables and netbooks was it was relatively powerful and had a decent-sized keyboard... and, of course, 10 years on, some people
could manage on a USB port and WiFi.
(Not me - sometime in the 00s I remember buying an Ethernet switch and half-a-dozen ethernet cables and lugging them to a meeting so I could demonstrate a website...)
Of course, Sony also had a hand in designing the original Apple Powerbook - which basically defined the design of modern laptops by moving the keyboard back and having a pointing device in the middle of the palm rest... and the Vaio range was what you bought if you wanted a Mac but needed a PC (before Intel Macs removed the dilemma... anybody remember SoftWindows?)