My impression is that the consensus is reasonably strong that masks work in and of themselves, that is - they do act as a physical barrier against transmission, but, most infections are happening at e.g. family gatherings and in households, so the actual effects of masks writ large are more muted than proponents argue. Basically, it's like saying seat-belts work, which is obviously very true, but regarding them in a kind of isolation that forgets about setting speed limits.