Again, all you are proving, is you don't understand how the progression of research and science works.
Let me explain it like this. Think of it as a puzzle. You have a bunch of people all working on the same puzzle. Everyone is trying to find a piece, and figure out how it fits into the bigger picture. It takes all of the pieces to see the entire picture (e.g., see the forest through the trees), as it is extremely rare to perform one study that suddenly identifies everything you need to know. If an individual like yourself continues to pursue your confirmation bias (as you have done again with this comment) without understanding the whole picture, then you arrive at erroneous conclusions, such as, "This puzzle piece doesn't fit in the place I'm trying to put it, so it must be a bad piece. Let's throw it out!"
Regarding asymptomatic/presymptomatic spread, there are two issues. 1)
Transmission - does it jump from an asymptomatic person to another?, and 2)
Viral load - how infectious are asymptomatic/presymptomatic people. That is, is asymptomatic
transmission a rarity because they are less infectious (as the WHO was claiming), or is it just as likely to occur because they are just as infectious.
The article I quoted definitively answered the second question. They are just as infectious. That was their focus, and a key finding that up to that point was unknown. The research community already KNOWS that asymptomatic/presymptomatic
transmission occurs, because it has been well documented. It just wasn't clear how likely that was relative to symptomatic transmission. By focusing solely on an accurate statement by the authors regarding their main research objective (infectivity versus transmission), and then making a judgement of it's utility based on a lack of understanding of the broader research field, you failed to dig deep enough to recognize that asymptomatic/presymptomatic
transmission has already been shown to occur, here:
Evidence Supporting Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 While Presymptomatic or Asymptomatic (which gives a good overview of other articles showing the same thing)
and here:
Error - Cookies Turned Off
and here:
https://www.nejm.org/doi/full/10.1056/NEJMe2009758
Are you getting the point?
and here:
Presumed Asymptomatic Carrier Transmission of COVID-19 | Infectious Diseases | JAMA | JAMA Network
and here:
Screening of healthcare workers for SARS-CoV-2 highlights the role of asymptomatic carriage in COVID-19 transmission | eLife
And I could go on.
Finally, as you continue to post glib comments about science, such as that it's just observation, you again are highlighting your lack of understanding on the matter. Travel to the moon was not made possible by looking through a telescope and observing the moon. The theory of relativity was not developed by seeing how time could speed up and slow down. Scientists develop theories and hypotheses based on understanding the physical underpinnings of the phenomenon of interest. Then they seek to design experiments, to test, validate, and further advance those hypotheses. It's called the scientific method, and is usually taught in middle school science classes. But again, maybe that was one of those classes you thought was too boring to attend, and so skipped it.