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Please don't think I am criticizing Dan's method!
This is posted to stimulate discussion about a very important part of guitar building.
I have my own strongly-held opinion and method, but I'll hold off for a bit.

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I add tension to the rod and then flatten the neck surface.
I glue the fretboard and level it.
It's not so easy to flatten the surface when there is a hump in the middle.
Maybe this a good method.

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Wah

Seems not unreasonable with a single action rod. But with a two way rod...

I like Dan's thought process, especially if he is using a single-action rod, which many people like.
He did mention his experience from a repair perspective on factory guitars, but his method isn't really applicable to factory methods, maybe it is.

I make necks two ways, with and without a truss rod, but I'll leave the non-rodded neck out of the discussion for now.

I glue a flat, slotted fretboard on a stout, uncarved neck, dead flat on the gluing surface. I glue with hot-hide glue, and it imparts a very small amount of back bow when it is dry. The fretboard is then arched & leveled dead flat, fretted, and the neck profile carved.

The strings under tension may pull a little up-bow, but normally it doesn't. The "pre-stressed" glue joint helps maintain a flat board.
The double acting rod can take care of it either way, with very little turning of the screw.

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Ditto. I don't see this being necessary if you use a double action rod. Tell me if I am wrong, though! If I'm wrong, I don't want to stay that way.

Doing the neck like Dan shows, would you ever actually need a dual action rod?

One thing that occurs to me is that if you used fish glue instead of hot hide glue, you could get a lot more control over the initial bow in the neck, and gain a lot of working time, by supporting it at the headstock and the heel, rigging up a clamp to depress the center of the fretboard/neck assembly, and then just clamp up as normal with lots of cauls and G clamps.

I rally hate double action rods. They can rattle and the relief they add is more like a smiley face instead of gradual natural relief. As dan says, if you build the neck " right" you don't needma double action truss rod

this is nothing new. Been doing that for years and I agree that a 2 way rod is overkill.

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

You do surprise me, John.

I don't recollect ever seeing this technique mentioned on any of your excellent videos.

I have chosen to use a 2-part rod, either single or double acting, for my necks.
As a guitar repairman since 1975, the greatest number of neck issues that I have experienced are Gibson necks with single action compression rods with an "S" curve in the fretboard.

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Maybe Gibson didn't install the fretboard the way Dan shows ...

John Greven, who also has a long experience of guitar repair and build, has just recently espoused the single action compression rod and abandoned the dual action rod.