We already know that non-SARS coronaviruses were being studied under BSL-2 conditions that are equivalent to a dental office.

Even if there’s only a 5 or 10% chance that this led to the covid-19 pandemic, it calls for action to update safety standards globally.

If it's a lab breach, the most likely cause is someone breaking protocol. If we somehow determined that everything in place was handled correctly yet the virus leaked through some before unimagined method, the research would be useful. I find it very unlikely that is the case, and even more doubtful that we would ever be able to determine it.

More useful research would just be additional studies testing various breach scenarios.