I suggest to display the "threshold" value in S.M.A.R.T. reporting.
The threshold for any given attribute further allows for green/red indications, red = (value smaller or equal to threshold).
Peter.
PPS I verified the 'or equal' part for red at Western Digital. PSPS many s.m.a.r.t. reporters provide threshold and one concludes therefore that it should readily be available. Speccy is generally the best when it comes to information about the system.
(Edited a few times for english language)