They already exist. They are called shared kitchen commisaries. Most places that use these are catering companies. The other majority is companies that need a HACCP approved kitchen for meeting safety standard, you'll also find companies that sell pre-made goods like baking cookies in bulk, or places that only make sauces.
Just think of a food truck business minus the food truck / cooking on sight, you deliver to parties and receptions instead with a-la-carte cooking ahead of time
There was a startup in Britain that was killing it with mom cooking and Dad doing the deliveries. But health authorities cracked down and the company cratered.
The customers loved the service but even with the help of an executive chef doing inspections the government wasn't satisfied.