For years I wondered why Jerry Busse didn't put an INFI machete into production. I've actively lobbied for a thINFI machete for 15 years. But I finally began to realize that, whatever his reasons, I was discovering reasons of my own why an INFI machete didn't make a lot of sense.
As Cobalt says, when it comes to machetes, thin blades obviously work best. Thin doesn't correspond well to the Busse model of indestructibility. ThINFI works in a small knife, but in a long, broad, machete-style blade optimally less than 1/8" thick, a blade meant to be swung at high speed into all kinds of rough material, it would be subject to major damage during "normal" use (as all machetes are). It would also be very expensive. To me, when you reach that threshold it makes more sense to go with something tough and disposable, and there are plenty of inexpensive machetes out there that do a perfectly adequate job on under-3" dia. limbs and saplings (as does the B11). Anything 4" thick or thicker is chainsaw fodder in my view, although I've taken out 5"+ dia. seasoned juniper clearing trail with a B11--no problem, just takes awhile.
So I no longer see an INFI machete as all that desirable--especially in terms of price vs performance. And anything longer than a B11 isn't going on my belt for long distances, anyway. Taking it a step further, any blade that is too long (or too heavy, for that matter) to carry comfortably on my belt is destined to stay in my vehicle (or at my house), which means it's not significantly more portable than a chainsaw. And as a chopper, no knife can compete with a chainsaw.