

With the plug in models that’s about the biggest you’ll find. Full range cook tops will offer larger diameters.
If you’re searing or pan frying, then a 12 in might have some cold spots towards the edge, depends on the quality of the pan. A 10 in or less should be fine as long as the pan is decent quality. For something like deep frying, stewing, boiling, etc the size won’t matter so much.
It usually means that 300 people were involved in the project at different stages of its lifetime. It probably also includes the people involved in sourcing the material, tools, people, workspace, etc. That’s probably 20 people who likely never touched the final product. There likely was also some marketing and business people involved. They did probably put hands on the final product for a photo op.