That study simply says that cloth masks are not sufficient for healthcare workers, due to the quantity of virus they are exposed to.
No shit, Sherlock.
Surgical masks (medical masks) are better, but still not ideal.
This is why every healthcare professional who had to deal with COVID-19 patients had N95 respirators, or if they could get their hands on it, N99 / FFP3 respirators.
A cloth mask is a lousy option, but can still protect against the biggest droplets - that's how the chinavirus spreads. That study you quoted is not about the Chinese virus SARS-Cov-2.
So you're wrong if you say it's useless. It's not useless. It helps. Probably only a little bit, but it does help.
Then if for you it's not worth it, that's your opinion and that's fine.
That study simply says that cloth masks are not sufficient for healthcare workers, due to the quantity of virus they are exposed to. No shit, Sherlock.
Surgical masks (medical masks) are better, but still not ideal.
This is why every healthcare professional who had to deal with COVID-19 patients had N95 respirators, or if they could get their hands on it, N99 / FFP3 respirators.
A cloth mask is a lousy option, but can still protect against the biggest droplets - that's how the chinavirus spreads. That study you quoted is not about the Chinese virus SARS-Cov-2.
So you're wrong if you say it's useless. It's not useless. It helps. Probably only a little bit, but it does help. Then if for you it's not worth it, that's your opinion and that's fine.