Great video. I've never encountered 頂戴 in a business context so I always thought it was casual/childish.
So if somebody offers me a drink and I say いただきます it's 丁寧, 尊敬)?
And 頂戴します is 丁寧, 謙譲? Or are they both 丁寧, 謙譲?
Does the usage vary regionally? For example maybe Kansai or somewhere might use it more than Kanto?