Not a fan of the ultra thin stuff. The standard 5/16 O.D. carbons will offer the most additional products to tune the shaft to perfection.
The other reason is, that the thin stuff really is very prone to how far out of center your bow may be cut. Sometimes that will yield odd effects.
And all this "added" penetration bla bla etc. is not worth the hassle as there were and are thousands of critters killed with thicker shafts of wood, carbon and aluminum.
The problem with the compound stuff (all real thin stuff is made for the compound shooters) is, that they will constantly change their names and layup to make better and stronger etc. arrows in the next season, but layup will affect dynamic spine despite the same static reading. For the center shot compounds with full adjustable rests this is not a big thing,but for traditional shooter the results is a constant trial and error if you have to replace arrows. While the standard 5/16" carbon arrows can realiably be calculated in comparison to wooden/aluminum arrows and are thus predictable. And I think they will not change much over time....