No rim is a perfect extrusion and bend, which means that if a machine is set to tension the spokes, the out-of-trueness of the original rim may not be accounted. for.

If the youtube video is the one I am thinking, it is remarkable how the person lacing does it.

Anyway, I build all our wheels, and haven't had any issues except for the occasional nipple undoing (which for some reason happened on a wheel on each our our new Thorns -- but it hasn't been an issue since I retrued them).

I have had two machine-built wheels from Velocity, both pulled spokes through the rim. The tension on them was (comparatively) much greater than I would have put on them. In the end, though, it might have been a problem with the alloy used in the extrusion, but the machine build didn't take account of it.

One of the sources for the notion that machine-built wheels aren't that good may come from the no-name wheels that shops hang from their ceilings to replace crapped-out ones on cheap bikes. Even the better wheels that might be offered need a bit of tweaking -- as I found with several when I needed to replace rims on my hire bike fleet years ago.