Yes, it was a big factor. The WHO was discouraging mask use for months after the pandemic started, even though we knew that the original SARS was airborne and we knew that masks were effective against other coronaviruses. They were pushing the line that there was "no evidence", when what they really mean was "there isn't overwhelming and conclusive evidence, and I am not inclined towards Bayesian reasoning in public because it presents too much career risk and I'm a total coward".