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Keeping in mind I’m not an engineer, Bike designer, marketer, brand manager or etc, my understanding is multi fold:
1\) Accomadating the larger post affects some suspension designs with a pivot point at the seat tube.
2\) 34.9 posts and frames that accommodate them result in an increased system weight. Every gram counts.
3\) Most brands try to have a uniform seat post size through their bike line and 34.9 would only be advantageous on a tiny % of bikes they produce.
4\) When demand from bike brands proved minimal most companies chose not to invest in making a post for that size. Minimal choice in the market removes any pressure for manufacturers to consider adopting the size.
5\) Many companies are now making longer travel 30.9 and 31.6 posts \(see \#4\).
If a standard doesn’t have a chance of becoming de facto I think companies avoid the risk of being a outlier.
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