Back then design
and engineering did not take a back seat to as strict of a budget.
Frigidaire, with GM backing, GE, Westinghouse, and Whirlpool all had plenty of market share. Borg Warner, AMC Kelvinator, and Easy all had room for a piece of the pie still.
Great designers, and engineers and many new ones coming into the field after WW2 ended. They took pride in what they did. Those were also the baby boom years.
Everything was done on drawing boards with pencils. Then technical writers made blueprints. Then tool and die makers formed and forged stamping dies for assembly lines. No robots, no computers.
A millenial couldn't begin to imagine.