They did totally err on another thing - the first
"full clamshell" laptop
was the Tandy 200, which came out in '85, 4 years before the NEC UltraLite.
I first saw a working Gavilan ("clamshell") at NCC in Anaheim in 1983.
It was in the air-conditioned main building - I heard that people DIED in
the tent out back!