If it looks like aluminium, maybe it is. Bad choice imho. However, I know there was some experimenting with hard anodising of the aluminium threads for a while, as a cheaper and lighter substitute for the brass inserts. So, possible. However, I have stripped the threads out of a Snow Peak GST-100, so brass is not immune. The real problem is the very badly formed threads on the canisters: a very poor design choice.
> all die castings are "pressure" castings as opposed to gravity castings.
Ah ... a friend of mine has been gravity-casting model train wheels for years. Maybe 'most' rather than 'all'?
> You have failed to test the Soto claims about the pressure regulator advantages.
But there are TWO sets of claims: some conservative ones made by SOTO themselves, and some far wilder ones made by various marketing people at various organisations. The ones made by marketing people often defied the laws of physics, so I could not see any reason to waste further time on them.
> I think it would be possible to also bench test each stove.
Have you read the CO series and the Winter Stove series? Have you looked at the detailed description given of the test apparatus used for monitoring CO emission, water temperature and canister mass during operation? A lot of $$$ has been poured into that gear.
> who cares about the carbon monoxoide in a windy outdoor typical operating environment?
Ah, but I never use a stove in the wind. I ALWAYS use it in a sheltered environment, often the vestibule of my tent. So, to answer your question **I care**.
> Soto igniter is a superior to any other I have used
The wire up the middle is more protected, and I said so. The problem many of us have had with piezo-ignitors is usually that the piezo bit falls to pieces. The jury is still out on whether the SOTO has a piezo-ignitor which is better-built than the rest. Perhaps you would care to give your opinion? (The more doubting among us usually carry a Bic lighter.)
I repeat: the SOTO is well built, but the marketing claims for amazing benefits had by substituting a pressure-regulator VALVE for a needle VALVE are pure marketing spin. Which is actually quite unfortunate.