This home I inspected the other day had some normal “plumbers helpers” items. I can picture this clearly, the plumber is setting the toilet in this brand new home. He realizes the floor joists are in the way. What would you do, of course, cut the floor joists. Call for your helper and tell him to get the saw.
They are not structural engineers and therefore don’t realize they need to put a support underneath or the new owners might be taking a “dump into the crawlspace” (a little play on words)