>> I have absolutely no preference for one theory over the other. Or neither. I
have no special evidence, and speculation at this point seems pretty pointless.
That's a false objectivity. We have very strong prior knowledge that diseases
arise naturally, without the need for human intervention. To assume there was
human intervention requires accordingly strong evidence, at least as strong as
the stength of the prior knowledge.
This is where Occam's razor comes in. We do not need to imagine lab leaks, when
a natural origin suffices to explain the pandemic.
Also, the "3 observations" you list are observations used to justify the
hypothesis that a lab like happened, not observations that caused the hypothesis
to be proposed in the first place. First people assumed there was a lab leak,
then they went out to find reasons to support a lab leak. That's putting the
cart before the horses. Solid reasoning needs observations to precede a
hypothesis, not the other way around.