Rims are made of softer/weaker materials than spokes. A smaller hole is not a benefit, its a disadvantage. Eyeletted rims are already known to offer durability benefits over rims where the nipple goes straight into the rim. And the eyelet helps spread the load over a greater area. Something like a traditional straight-pull spoke poked straight through a rim would cause a considerable greater load concentration than even a regular nippled build. Unless the rim is reinforced at the spoke seat, I foresee regular pull-throughs.

If the DS spokes get thicker where they attach to the hub, the center line of the spokes has to be moved further away from the cassette. Even more so in a crossed pattern.
This reduces the bracing angle. Or "dish" if you prefer.

Also remember that the bicycle industry is quite influenced by fashion.
Nipples by the hub were "new" for awhile. New always sells. Then its not new anymore. Since it Didn't offer significant benefits, it was dropped. You may see it return eventually with a slightly altered sales pitch.