I think one of the things people over-estimate is how much evidence is used in making public health decisions.
The UKs advice is to wash hands but not to use a face mask. Hand washing is essentially free but the cost of producing reusable cotton face masks for every single person would likely be ~ £1 billion. If that is money wasted, it is still extremely small compared to the economic devastation which could cost the UK government ~ £100 billion [1] and the economy as a whole significantly more