Edit: I wrote this after reading about half way down the thread. I now see that you realised this but ill leave it here anyway.

Its true that having nut hands in a range adds value to that range. That point seems pretty obvious. But the play still needs to be +EV in a vacuum before it becomes a good play.

e.g. If we have are in a spot where villain will call us with the top 60% of his range and we need 50% FE for a bluff then when we have a nut hand he will call 60% of the time, and when we have a bluff he will call 60% of the time.

The EV for shoving a nut hand is positive. The EV for shoving a bluff is negative. When we fold our bluff hands the EV for them becomes 0.

So when we play the whole range as a bluff our EV is the sum of the two which is less than if we just shoved the nuts and folded the bluffs. We have raised the value of our bluff range, and maybe even made it +EV. But it will never be enough to make it more +EV that just shoving the nuts and folding the bluffs.

You cant just look at what happens to the value of one half of our range (e.g. bluffs) and say that the value of the whole range has increased. I can see you using this as an excuse to bluff in spots where you will probably be called and thats just bad.