if your buyers have paid for a full home survey, then the surveyor checks for things like:
any structural damage
damp/damp proof course
roof tiles that may need replacing
condition of render
condition of brickwork (e.g. does anything need re-pointing)
general decor
wear and tear of kitchen / bathroom units
flooring - carpets or floor boards that may need replacing
etc
They are not employed to 'make the purchaser happy' but are independently trying to guage whether the price agreed for the property is in line with any work needing carrying out.