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Even though it is dark enough at my Obs for RGB, I actually prefer NB for the level of detail it brings out in my primary targets - emission nebulae. The most beautiful structures in the Southern Hemisphere can be seen in all their glory in NB.
I also see a trend towards RGB Ha, particularly for those galaxies with Ha emission blooms. M83 is a good example where Ha enhances a good RGB image.
And of course I must add that PI is not required.
As far as "respecting the light" is concerned, narrowband is light as much as RGB is light. The poorly performing human eye does not really capture Ha, but it's still part of the spectrum, and flooding the universe with its glory.
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