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If its any comfort, I never used the steam wand on my Classic for probably the first 8-9 years I owned it. I used it for the first time about 2 years ago when I put a Rancilio wand on it. It won't hurt it, just undo it and take it off! Think of it as lightweighting. Colin Chapman.
Your metric vs Imperial comparison, what happens if you have a friend round who likes milk coffee? Not all nuts and bolts are metric. I don't just offer my friends espresso only or FRO.
I think the answer is probably any single boiler machine never set to steaming temperature, which essentially is doing that, but then doing it separately to a higher temperature for steam - oft to the consternation of those who want to make lots of milky drinks b2b!