If you study the scientific literature for works that measure actual infections with/without masks (and not hypothetical scenarios on droplet travel distances) you'll find that the science is far from being established.
Take a look here just how many works indicate no effect:
https://swprs.org/face-masks-evidence/
These may be cherry picked of course - no question there, still it is evidence that the science is not settled.
For a "home-run" review see the Cochrane review:
https://www.cochrane.org/CD006207/ARI_do-physical-measures-s...
Not even N95/P2 respirators were found to be effective.