You’re right, a fabric mask won’t stop it but it helps. That’s why European countries are insisting on FFP2 or higher for all, not even a surgical is acceptable and they accept far less exemptions than us and you have to prove it not just self declare
Yes, I would feel more support for this is it was FFP2 masks as that would have a real health benefit to counter the educational negatives.
However, I just looked on Amazon to see if I could get any and it's £25 for a pack of 20 and they're disposable! That's a 3 week supply for one person - way too much money for most people, I'm sure.