My two penn'orth. If I order a chicken curry, or even a chicken Madras, I expect a largeish quantity of a relatively thin sauce, and an adequate sufficiency of chicken (the latter must never have seen the inside of a tandoor); if I order a bhuna chicken, I expect a far drier dish, but not one in which the sauce has been reduced to the texture of porridge — rather, there should have been less sauce in the first place, which has then been reduced to achieve the desired consistency. Thick, sticky, curry sauce does nothing for me, except in dishes such as lamb dhansak where the thickening is intentional and facilitated by the addition of dal. From my memories of "the good old days", I seem to recall that chicken pathia had a similar texture/consistency to bhuna chicken, with a flavour closer to chicken dhansak.
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** Phil.