I totally agree and like Bruce, have dealt with many building officials and builders directly- at least, we aren’t seeing stubs, buiried under the stairs- too much, anymore. That said, back flow preventers are my biggest issue today- plumbing inspector signs off on their installation- however it is an open box, leading directly to agrigate - so, all the possible sealing is wasted.
My preference would be, just test and let the professionals fix the problem- the cost benefit is a win for everyone!

Radonaway has the least expensive sniffer, and very functional- can get saturated with multiple high readings but great device for the money.

I have had great success with Bosch SDS max - great longevity and the antivibe is nice, light enough to do foundation cores, without fatigue