There's a huge practicality issue for the chef. They don't have the food in microwavable format for many dishes.

But to me thats the end state of this conversation. Like lets take shipping as an example, we came up with pallets and containers not because they're useful for a person to move but because they're helpful for robots (and analogs) to move. People aren't born with palletjacks for hands. So to me it seems as you add more robotics into the kitchen you're going to slowly change your supplies to arrive in more robotic form.