I wouldnt get too worried by this sort of nonsense- its not confined to Boema. My step daughter was taught similar things at a tafe coffee course. Regarding boemas- Ive used one on a coffeecart and found it the equal or superior to my Bezzera. The guy who owns the single group I used has a few 2 groups and swears by them. Good soilid machines. The turbo frother is not nice to use, but Ive been told that with care it is easy to use in coffeecarting situations ( long queues). The new Boema 4 hole tip is amazing- Ive got it on the Bezzera.