Maybe "mask requirements" are a sign of society advancing? There was a time in human history when we didn't bathe regularly, or brush our teeth, or have sewage removal systems in cities, etc. Maybe the next step is "you know, breathing in particles that came from the other 600 people in this railcar is not so great".
I certainly don't see a reason to go maskless on public transportation in the future. And, as supply chain problems work themselves out, someone will probably make masks that actually filter out virus-size particles and fit more people's faces. (I feel like every mask I've bought so far during the pandemic has either been completely ineffective, or has been designed to fit someone that is 1/3 my size.)
I certainly don't see a reason to go maskless on public transportation in the future. And, as supply chain problems work themselves out, someone will probably make masks that actually filter out virus-size particles and fit more people's faces. (I feel like every mask I've bought so far during the pandemic has either been completely ineffective, or has been designed to fit someone that is 1/3 my size.)