An appraiser while looking at the interior of the house will make note of any defects or missing items from the norm, but he/she doesn't approve or disapprove a loan. An appraiser is not an inspector and normally doesn't go into the attic or do any extensive inspections of systems such as plumbing, electrical, CHVAC, etc The will note any blatant safety issues such as missing porches, railings on decks, loose/exposed wiring, check for aluminum wiring, etc. Their charge is not to do an inspection of the house.
For example, An inspector will look at an oven and test the temperatures to see if it is heating correctly. The appraiser just checks to see if there is an oven. An inspector will check the temperature that is coming out of the duct, an appraiser will make sure that there is an AC present. An inspection looks to see if there are leaks in the plumbing and H2O heater and that all is operating as intended.. An appraiser only confirms there is an H2O source present...he/she doesn't check temps and normally doesn't check for plumbing leaks.
Hopefully your Brenham buyer had a home inspection by a licensed inspector? That is the person who should be catching the noticeable defects.