The use case I am seeing is a foldable desktop machine. I currently have my work macbook pro hooked up to an external monitor, and external mouse and keyboard. The laptop's screen serves as a smaller second screen. The laptop's keyboard goes unused.
I move the machine between home and work and have the same setup in both places. It means that I only use the laptop keyboard in rare occurrences when I'm not working at a desk. Travelling. Sitting in the sofa. Rather rare compared to the daily use.
I can easily see this foldable work well for professional use. A full display when at a desk, and with an on-screen keyboard when not at a desk.
Meaning it's not for working full time at a café. It would be for hybrid workers. It's not a laptop. It's an itop or airtop (ugh, a new category of products at least).
It could potentially provide a very clean setup if they sold a magnetic desk arm to attach it to, which provided charging and USB-C connectivity to external accessories. Less cables. And more $$$ for Apple. I'd of course need to buy two of those arms too (office and home).