So better, in the same way I believe you define it, a faster kite. So a kite with also more range, depower, lift and speed from less drag. But also less weight and associated benefits. But hey if you look back I did say that just in less words, those being "lighter and less drag".
So a number of things when you think of a thicker airfoil. There is a lot of misinformation on airfoils. A thinner airfoil is better, but for a number of design limitations thicker airfoils are used. Kites are interesting in they are basically just a piece of flexible cloth, of a thickness that approaches almost zero. They take their shape mainly by how they interact with the wind. Foil kites rely solely on the wind to affect their shape, albeit in interesting ways of storing higher pressure areas to work against the lower pressure areas, but so too do inflatables have to take a shape against the wind, as they are mainly loose fabric.
The tube has never been considered a good aerodynamic structure. Now the tube with a skin on one side is a bit different, particularly with the skin on top and as well tubes at differing sizes can have vastly different aerodynamic properties at different air speeds. So saying that you can have a reasonably thick tube that for general kiting is not so bad. But in general to make it thinner will improve the aerodynamic properties and that is not to include the weight benefit too.
I am not talking about sticking razor blades on the LE. Though if you could a maintain direct heading of the LE into the airstream then yes a Razor blade would be better. That is not possible really though, a variety of AoAs will see the LE too change angle. The only slight exception is where like with foils you can alter camber so much that in some realms the LE can remain static. But you add in the complications of flight and particularly a kite which changes AoA mainly from window position and then no a sharp LE is never going to be best. Having said all that there is a great difference in scale from a razor to a 1inch, or 6inch or 12inch tube. What are the exact benefits? Well it would have to be tried. Ozone originally made an attempt. To me they seemed good, but from what I was told they were too hard to relaunch. Strange should you give these people a Peak to use....From what I have seen of the bridle designs from most tube designers is they couldn't design what I am thinking. Which is to use a bridle design and density, like used on something like a Peak, so you can get the tube really small, maybe 2 inches, maybe 3, maybe 4. Maybe you go higher pressure, maybe you use thicker material. There is a lot of speculation, but it is not silly because thin carbon tube kites work and so too do many bridles on foil kites. If you make bridles out of 3mm ropes no this will not work. But kite designers that do and have done that are just showing how little they understand. Dumb is dumb.