I dont agree about the water conditions making a huge difference
For a TT maybe yes - but a raceboard will fly over the chop usually.
And in waves, however small, I will say I get going earlier/faster because you can utilize the wave power or backsides, to get planing - and once up, you work in sync with the waves both ways - so actually easier often (if used to waves that is...)
I dont find super smooth water to be way better than small chop, regarding how early I start on a raceboard
Just a very different opinion and experience, I know
Of course you can maximize your upwind angle more in totally flat water, no doubt.
But the difference in planing is extremely small IMO, for raceboards or even waveboards.
Disagree with you Frank,yes the raceboard minimises the effect of current and swell but it is still a factor. In flat water with no currents their will always be considerable difference.