Dismissing the theory outright has never and will never be an option. I don’t like that this is what the team decided to do, and I suspect there is a lot of tension in this investigation.
There was at least one paper calling it "natural selection", and some folks who read it agreed that it ruled out laboratory accidents:
"The high-affinity binding of the SARS-CoV-2 spike protein to human ACE2 is most likely the result of natural selection on a human or human-like ACE2 that permits another optimal binding solution to arise. This is strong evidence that SARS-CoV-2 is not the product of purposeful manipulation."
https://www.nature.com/articles/s41591-020-0820-9
https://twitter.com/ehundman/status/1246597925288816640
https://www.newsweek.com/claim-that-coronavirus-came-lab-chi...
That's literally what a gain-of-function experiment is. These are done to study how viruses interact with humans so that we can deal with them better. There's nothing sinister about it, such experiments are happening all over the world and they did happen in Wuhan.