In fact it is probably the only curry we really know FOR SURE how the BIR cooks.
If it's so clear, which recipe do you mean?!!
The basic recipe George used by both the East takeaway and Maliks. That is, sugar and coconut in huge quantities into the pan (and ground almond in some cases), a couple of ladles of base sauce and a bit later the addition of lots of UHT cream, and boiled down for a few minutes. It really doesn't get any simpler, there's NO technique involved and importantly relies entirely on the base for any 'curryness'.
we became aware, via Maliks webcam and other videos, that many/all places normally start off by 'dry frying' sugar and coconut powder
No George there really is no dry frying of the sugar/coconut to speak of. I can say this with some certainty as I've watched them. They only really just add the two ingredients, SOMETIMES give it a brief stir and SOMETIMES leave it for a while if they're doing other curries at the same time. There really is no intention to caramelise the mix. Indeed, often when they are rushed, I've seen them add the base sauce as the first ingredient, swiftly followed by the coconut and sugar. The dry frying is something of a myth!
plain chicken curry, but I still think the latter would actually be a better benchmark, as I think CA is suggesting, for a wider variety of more complex dishes.
Yes and no. Clearly there are a greater variety of savoury curries than creamy ones, so this would suggest a basic chicken curry as a benchmark would be ideal.
On the other hand even the 'simple' chicken curry involves potentially unknown ( or at least difficult to master) technique and certainly involves at least some added ingredient (spice etc.) at the frying stage which complicates matters.
I would personally prefer a savoury curry as a benchmark as I hate korma but there are too many pitfalls, whereas the korma is 'known', simple, and likely to be eaten and therefore tried by more people.