hehe, I like how you think ... point, counterpoint to argue against your point, then counter counter point back to start, then new tangent! But, when you finally decide, no one can say you didn't think through all the options.
I have been kite foiling for 5-6 years, focused mainly on riding swells and waves sometimes. I haven't done a lot of big wing kite foiling, but a bit ... I personally don't find that I can have worry-free surfing, either its pulling a bit or the angle's not quite right or the lines are getting slack. If I am worrying about or fussing with a kite, then I am not focused on surfing the wave, and that doesn't do it for me.
My vision: surfing down the line on my sup foil, with the wing just floating there while I surf. Then forget the paddling or pumping, just wing it back. Vision #2: long downwinders riding windswells. Something I rarely do kiting, as I can't trust that the downwind wind conditions will be adequately kiteable. And I've never done this sup foiling, as it sounds like way too much work for the amount of riding. But wing assisted, could be fun.
Slogging out: super easy, you just paddle the sup with wing floating behind you. Easier than a windsurfer for sure.
Carting gear: a non-issue for me, as I am already lugging around massive sup foil for surfing. But an unintended benefit: takes me 5 minutes to rig up versus 15. Which may make quick strike short sessions more feasible, when wind chasing involves fitting in small windows in a too busy day ... 20 minutes saved may make the difference between getting wet or not.
Those are the selling points for me trying it. I need to get competent enough that I can properly judge the capabilities and weight it against other options. If it doesn't work, then I will have a Gong 5m for sale.