Perhaps, Broken Arrow, but some of the old khukuris I've seen obviously haven't been polished a lot, and they're still lighter and thinner. I think in the old days people weren't so desirous of breaking padlocks and prying up blocks of cement with their knives.
The HI kamis are right, their thick blades won't fail. Many of us use our khukuris around our property, or carry them in our vehicles, and the heavy blades are great for that. But I think the utility of a heavy blade is compromised simply because the owner won't pack the heavy blade around like they would a lighter one.
Many of the village khukuris are also lighter than standard HI models. People carry these knives up and down steep mountain trails every day. Sure, a lighter khukuri might not take as much abuse, and could conceivably (unlikely) even break after a few years. But at least the owner hasn't carried an extra pound or two up several hundred thousand feet in the interim.
I would love to debate this topic with Bura.