Just curious, but why do you find that this is so important? Average power is one button press away on the SRm head units. I was the guy with 10 data fields on each screen of my garmin (does anyone find that surprising? ) so was understandably nervous when making the switch away from garmin.

i soon realized why real-time AP doesn't matter: if my goal is an interval at 300 watts, all that matters is what I am doing right now. If I have made it halfway through and my AP is 280w, that doesn't mean that I Gould do the remainder at 320. Took me a long time to figure that out, as I had some years where I was aiming for AP goals.

The found of SRM has a strong belief on this matter, so the unit reflects his sensibility. After training this way for a number of years I am inclined to agree.