I don't weigh in on here very often anymore.... but I am going to add my 2 cents.
At this point in time, I believe it is up to the individual to protect themselves and not rely on the "perceived" health status of others. By perceived I mean that although everyone is tested before boarding, we all know that people are catching covid after they test and then boarding with it, or they have covid but haven't yet tested positive (this happened to my daughter and she finally tested positive on day 5). So what I mean is, it is up to the individual to protect themselves, and wear a mask. I have zero issues wearing a mask in an indoor crowded space and will do that on my b2b in November. I am relying on myself to stay safe onboard.