Working out the initial cause of this Covid outbreak is far far far less important/actionable than working out what we should do differently when (not if) another virus starts spreading. This concept should be familiar to those in tech already: https://codeascraft.com/2012/05/22/blameless-postmortems/
As applied to this situation, it doesn't really matter. The Chinese government has a vested interest in any investigation being labeled inconclusive. Whether it was a lab leak or a result of unhealthy agricultural practices, China doesn't want egg on its face. They'll do everything in their power (which is a lot) to avoid having the finger definitively pointed at them.