So cloth and surgical masks stop large virus droplets but they do not stop smaller particles from escaping. With the Kent variant and now the more transmissible Delta variant, you need less of a viral load and small particle build up in the air even if wearing a cloth mask or disposal surgical mask will not prevent you from catching it if the place is poorly ventilated.
Coupled with the fact that many wear them wrong, touch the front (with potential viral load on), don't wash them after each use or don't change them frequently enough (as soon as they become damp with moisture from your breath) , they are not as effective as many people like to think.
Against the first variant they were more effective due to the larger droplet size. But yes against delta the only real full protection given is from a FFP2 or FFP3 mask but many hang onto info from a year ago.
Yes cloth masks stop larger droplets but if in a poorly ventilated area this still won't prevent anyone from catching it if they are there a period of time (e.g a school day)
The biggest risk factor is ventilation, hence SG is also now putting CO2 monitors in schools.
For all the posters which say what about CEV children etc I'm afraid if it's a poorly ventilated area (many classrooms are) then actually little protection is given from a standard cloth mask and if your in this situation then invest in a FFP2 or FFP3 masks instead.
In healthcare workers for instance (who regularly wash hands and change masks) the only ones that had 100% protection against contracting covid were in the more advanced masks
I don't agree with SG keeping them in schools because it effects learning no matter how hard thd teacher tries. They are better improving ventilation as sadly this virus is not going to disappear.
Children are thankfully low risk of serious illness and latest studies are also showing low risk of long covid (approx 1% at 8 weeks past infection from latest Zoe app webinar)
As for those who said they prefer scottish rules you may wish to understand them in more detail. Fancy dancing at a wedding with a mask on?
They are clarifying if they are needed in nightclubs which is a bonkers thought.
As said sadly this virus is here to stay we all need to live with it long term, I'm just grateful that a large proportion of adults who are greatest at risk have been vaccinated so it makes it less deadly.