IMO - it's more about marketing than anything else. The benefits are too difficult to explain and so don't command a premium. So since the bike company can't expect a commercial benefit form OC rims, they don't see it as worth the bother.
Also, the issue isn't that bad, and it's certainly not smart to discuss issues of rear wheel dish when trying to sell bikes.
As a practical matter, I've been building trouble free wheels for decades, and I'm most definitely not the only one.
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