I would think it would be impractical. can you imagine rushing round a extremely hot kitchen assembling meals wearing a mask. I would think anyone in that situation would be gasping for air.
I understand the panic during COVID, but otherwise I find this obsession with extreme hygiene rather peculiar. Your body is covered with bacteria, good and bad, you would die without all the bacteria contained within the body, I do not just mean the digestive biome. The air is full of bacteria as is every surface in your house, you breathe it in with every breath. Most of this bacteria is common to all humankind.
Are you constantly hearing of people keeling over with bacterial infections as a matter of course? I don't.
Yes, there are harmful bacteria around, but for most of us our immune systems cope perfectly well with it. Those with impaired immune usually know and are advised what protection to take. An immune system which is never challenged is a weak immune system
For more harmful common ones like flu there are vaccinations. Occasionally, very occasionally, there are illnesses like COVID where we do have to go to extreme lengths to control it, but as long as a kitchen is clean and cleaned regularly and, yes hair is tied back and the staff start the day with clean aprons, I am completely laid back about the rest.