Just wanted to share "kitesize versus wind" experiences.
In marginal winds, really big kites, but not max kites, are preferred.
For me at average weight, that is a 13m2 high AR kite (using the Dyno right now).
Marginal winds is around 8 knots.
In "easy" winds, where all kites can hang, like 10 knots, a wave kite (lots of range and depower) between 9 and 11m2 works great.
In higher winds - when out with say a 7 or 8m2 wavekite in waves (waveboard of course), you can use almost the same size.
Because the apparent wind contribution is marginal, the higher the wind.
AND, because you will feel more comfortable having a bit of a pull to lean against, for stability and when jibing (to make you weightless).
So yes, you CAN easily ride a 4 or 5m2 when using a 7 or 9m2 wavekite with a waveboard, but it does not feel that good.
In marginal conditions, big kites like 13-15m2 works perfectly.
But as soon as the wind is up so "any" kite can hang in the air, much smaller kites seem to be preferred.
So in 10 knots, maybe up to 12, 9-11m2 works great.
When the wind increases, you still use a bit smaller kite, but not the same difference as in lower winds, is my experience.
I dont know why I am writing this, as experienced hydrofoilers knows this, and unexperienced have to learn by riding...
But maybe just sharing can add some new points ?
If you are racing, it is a totally different game, and using a big kite can be a huge advantage maybe...
But I am talking about "general" riding here, not racing as such