As a surfer and freeride snowboarder (not freestyle), but never windsurfed or kitesurfed, riding switch sounds SO far off and unnatural to me and the idea of having to learn to ride a foil switch sounds...very difficult!!
I know that if I'd put in the time eventually I'd learn it, but I'd rather "invest" my time in learning to tack, nailing my jibes (95% success rate now) and riding waves with the wing. I have also put a fair amount of time learning to properly ride upwind toeside, wearing a GPS watch and analyzing my upwind angles, looking at video to get better body posture, to the point where I'm happy with it. I know I could perhaps gain 10-15deg more if I switched my feet and ride heelside, but I'm still going better upwind toeside than twintip kitesurfers are going heelside.
I know people will say: just learn it and you'll be better off, and I agree, but you don't HAVE to

It all depends what you want to do..!