You're quite right, but there are bikes and there are bikes.
It used to bug me (probably entirely out of proportion) to hear the "swosh, swosh" in synch with my cadence when climbing out of the saddle on my sus fork MTB. A radial relace heads-in removed the brake rub and provided peace of mind.

And while the added lateral rigidity might not do any good, I can't come up with a situation where it'd be a disadvantage either.

One should be able to use it as a trade-in:
- Thinner spokes increase lateral flex
- heads-in reduce lateral flex
- going from cross to radial, heads-in might allow you to go down one size in spoke diameter while retaining the lateral rigidity of the original build.