Seems like much of the discussion just ignores the FBI's assessment...
Not at all. They have been pretty clear that they can not confirm the view but all US government groups thinking the lab leak hypothesis is more likely has said that with only low/moderate confidence.
More significantly in this context, the information they based their decision on has not been released so it is down to what level of trust you have in the FBI telling you the truth. I'm pretty sure that in the mess of GOP/Democrat/Trump threads, I can find plenty of people saying the FBI is untrustworthy.
As I said before, my conclusions are based on the evidence available, not on what some person speculates other groups with long histories of suspicious statements base their decisions on.
p.s. Don't know why you are talking about proof because no one in this discussion (other than Butler and lomotil) is talking about proof as we are all quite aware that science doesn't 'prove' things. We have all been quite clear that based on the evidence available, a lab leak seems less likely.