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I think this article from Scientific American does a great job of laying out some of the reasons these documents are important.

https://www.scientificamerican.com/article/a-fight-about-viruses-in-the-air-is-finally-over-now-its-time-for-healthy/

"The operative phrase here is “through the air.” It’s plain language that anyone can understand, and this switch from jargon such as “airborne” and “aerosol” may finally clear the way for researchers to get funding to study better, real-life ways to protect people from a range of infectious diseases.

And just maybe governments, retailers, school authorities and others can now start to get solid information about ways they can clean indoor air. While it is going to take more than a wordy WHO statement to persuade gym owners that fogged-up windows mean too many people are huffing out potentially infectious air, the new wording does provide a better explanation of why it’s gross and unhealthy."

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"This should clear the way for funding more and better research on the transmission of infectious diseases—not just COVID, but influenza, respiratory syncytial virus (RSV) and viruses that cause the common cold. That, in turn, should give managers of schools, retailers, airports and other public spaces the information they need to help keep air and surfacers cleaner. Because if people understand the physics of disease transmission, they can find ways to safely keep schools, shops and restaurants open during outbreaks and epidemics with better practices in ventilation, air and surface cleaning and foot traffic control."

...

"“It’s now respectable to do this research,” Jiménez said. “People can get funding to do some research about indoor air and engineering systems. They are stepping into fields that they really wouldn’t work on before. So you see some encouraging changes.”"