What little extra wood you lose, you make up for in a more rigid, less likely to flex or warp blade in the full kerf versions
Only time I can think that a thin kerf would be useful is on grossly underpowered saws, OR in production of LOTS of thin strips/inlay stuff with expensive exotic woods. And if the wood is that expensive/rare, then a bandsaw would be very viable alternative if not a better choice all around
John