This was the last gasp of Johnny Ive. And yes, it was terrible. It got us ending the incredibly successful Macbook Air for the too-compromised 12" Macbook (1 port, remember?), the pointless Touch Bar and the terrible butterly keyboard (remember how dust could kill it and I'm sure Apple spent a fortune on replacements?).
Why did we get all these things? It wasn't just thinness. It was to raise to Average Selling Price ("ASP"). Someone at Apple decided the ASP was too low.
Ultimately the Macbook Air came back and it's really the SKU the most people should buy.