The WHO have changed their views since then and have now finally acknowledged that Covid is an airborne transmission rather than droplet. This means that the original handwashing, surface cleaning, perspex shields, distancing advice was wrong. It was understandably assumed that the virus was spread by the same droplet method as the other well known RV's such as colds and flu etc, A lot has been learned since then.
. As far as mask wearing goes only a properly fitted n95 mask would offer the minimal protection. Surgical masks are about as useful as putting up a chain link fence to stop mosquitos. Also bear in mind that n95 masks with a valve do not stop the wearer from spreading the virus, they only stop the wearer from inhaling it, so as a method of stopping the spread it has no use at all.
The main benefit of mask wearing is psychological and for those people who have been brought up on the "coughs and sneezes spreads diseases" mantra, a hard thing to let go of. I find it so ingrained into my mindset, it's become almost an instinct.
Having to accept that there is very little we can do in terms of protecting ourselves is extremely difficult for many people and even harder, I imagine, for government health officials to admit. It is all just theatre now, but if wearing a mask makes you "feel" better, less anxious etc, then perhaps for your own MH you should carry on regardless and to hell with the science!