I can 100 % second Joel´s statements!
Just last week I had a mind-blowing foil-wave session with my brand-new Peak4 4 m² (my third Peak after the 5 and the 8 m²) and the Moses W633 on a 100 cm Board (Anton Skater).
Currently, I improve my skills with each session in the waves, and this time it was 16-20 kts in hip-high clean breaking waves. There were a few wingers out but I was feeling so much more agile and dynamic on the waves. Just a dream! As soon as you have just any breaking wave (no matter how small) you can surf with the 633, no need for a larger wing. The kite gives you much more power / pull to get into the right location on the water, in an instant, much easier than with a wing (it seems to me). More freedom, better view. The Peak can be steered so effortlessly, just perfect.
I´m still far from doing real cut-backs, but I´m slowly getting there, I guess. I don´t think the W633 is limiting me in any way, it can do very sharp turns if ridden with the right technique. I don´t have used any other foil yet, however.
The Peak definitely gives you the ability to simply surf the waves with zero kite input, it justs drifts with you. Zero wind noise in your ears, no line tension (OK, maybe 1 kg), no issue at all. As soon as you steer the kite, it is there again and gently pulls you to the outside again to repeat the joy.
So I think it is the combination of the Peak with a surf foil.