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Good question, not sure I’ve got an answer. Just a term I’ve heard a lot, always sounded like it was doing something on the molecular level. Which I guess everything is. I think it’s this. When you stretch the milk, you’re trying to (about) double it in volume with tiny bubbles (microfoam). If the bubbles are too big, that’s foaming the milk. I think. Lance will better explain it. But foam like that is the way it’s done in most of Italy (from my limited experience). It’s just a different way of doing it.
If you liked that, you’re going to love this. It’s almost exactly the price tag to switch - completely - to renewables.
https://e360.yale.edu/digest/the-global-price-tag-for-100-percent-renewable-energy-73-trillion
I know, I know, many studies, many different amounts, but come on! Let’s try!