He probably didn’t want to deal with the air he would’ve introduced into the system. Or he was extremely lazy. Or both aha.

Realistically, the pressure was probably less than 1 PSI, as residential gas is measured in “inches of water column,” especially after the regulator. Where I did gas work, even before the regulator was never more than 2 PSI.

Gas is verrrry simple in almost all single family home applications. If you test all the joints with soapy water (with the gas turned on) you will find any leaks very quickly. I know it’s scary, but water will do much, much more damage in a small amount of time than gas. Of course, if you’re simply not comfortable doing it, hire a professional, but trust me, if lazy apprentices who don’t think past their next vape hit can do it, so can you.