Being that it is a huge tourism driver in Japan I would assume if it was being done they would go both routes to get 2 separate bloomings. An alternate theory would be to choose tress that all bloom same time and this could if early bloomers have less variability lead to average early blooming. Then would that make up 1% of the increase in data or 10 or 90
Yeah, I get that this article shows evidence, but it's not the slam dunk that the author is making it out to be.
Given the evidence slam dunks are not needed. The situation is so clear only delusional (or highly uninformed) people convince themselves there is still soubt about it