Look up commissary kitchens. A ton of food is made that way, and I don’t see it as being all that different.
And the DD-specific kitchen I know is basically just a typical restaurant kitchen minus attached dining. You can make slop in an industrial park, you can make slop in a real restaurant (I’ve certainly experienced that).
Why in the world would it be necessary to have dining tables for a kitchen to make good food?
A restaurant with a physical presence with dine in service has a reputation to maintain, a ‘cloud kitchen’ food seller does not have the same reputation to worry about.
Many resstaurants are just heating up frozen portions delivered from Sysco or similar providers anyway.