It didn't take them 2 years to figure that out, it took two years to complete a study that came to a conclusion that, yes, they probably already knew to be true. The way research works is that you have to go through the motions and get something documented with evidence so that you can make a case to change something.
Did you even read the paper? The researchers are never just figuring something out and having a revelation, it just comes across that way when your only source is another media article picking one quote out of many to make a point in the context of said article.
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