Every HI-initiated repair I've ever done was started due to their written report. When done, I prepare my own written report.
Almost all of them contain something like:
"Item 7, GFCI in bathroom does not function and is not grounded. Replacement of device and proper grounding recommended."
My response; "GFCI receptacle are allowed to be installed on ungrounded circuits per NEC 406.4(D)(2)(c). Use of the common 3-light plug-in testers is not an approved method of testing GFCI protection per UL White Book section QCYU. Only the receptacles' built-in test button is approved for testing the function if a GFCI device. Device was tested using this method and device performed as designed and intended."
I give the report not only to the person that hired me, but I mail a copy to the HI. Hopefully they will learn from it.
If it's a two wire branch circuit and doen't contain a ground that is fine but what about circuits that should be grounded and the ground is open. Were these receptacles marked with the "no equipment ground" sticker?
The inspector is letting the buyer know that certain parts of their home are not grounded.
I got involved by doing an electrical inspection after a home was purchased and the buyer thinking that it had been rewired. I had to tell the homeowner that they had a new service and some of the wire that they could see in the basement was new but the rest was still knob and tube and about 80 years old.
The home inspector had written up the missing grounds on all receptacles (except kitchen) and suggested they get an electrician before they purchase the home. They didn't GFCI protect or mark the receptacles (no equipment ground) on the three pronged receptacles.
A home inspection is non-invasive and the home inspector doesn't need to figure out why a ground is missing, only that it is missing.
A home inspection is not a code inspection and missing grounds can be a matter of concern for a home buyer. This is information the buyer may not be aware of.