Annnnnnd this is why I'm not a pro.
Mackguyver: ETTR is not new to me at all, I've been doing that for some time. That principal is well in-hand for me.
But if I understood your and Jrista's posts correctly, I just learned that my in-camera WB does affect my RAW files due to its effect on metering. That's a big deal for me, as I shoot everything in AWB and JPG+RAW, and I simply correct the white balance in my keeper RAW files.
So now I do need to sweat my WB. I always thought that RAW alleviated me of that burden and I just focused on a general (non-color-specific) histo.
Absolutely, the in-camera WB has an effect on exposure. Also, I find the immediate results on the camera screen to give a better evaluation of what the end result will look like. I shoot AWB most of the time if there is enough color variation in the scene but in natural environments I find an approximation using cloudy/daylight/shade works best. That approximation is good enough to tweak in post if needed.
I am technical about my photography but don't want to turn it into a science. So a few clipped channels here and there are ok with me as long as the overall result is to my liking.
FWIW I'll join the red flower post
Here's one shot with my NEX-6 and a Canon 50mm f/3.5 FL Macro (from the 60's).