Yeh, I would say that in all of the notes of incense that I have gotten from Balkans, I wouldn't have been able to pick out Frankincense or myrrh as an exact aroma. Actually, I wouldn't know a myrrh or Frankincense smell by name.
It is like when someone asks about the cedar smell in some cigars. Guys will start over-analyzing the question, which leads me to wonder if some guys just can't smell or sense the same things.
Or when I get hints of grapefruit in a resiling wine, and my wife doesn't.
These hints, subtle tastes, and such are not obvious slaps in the face with an aroma. They are what we say they are, hints, traces, etc... One note in a hardstruck chord. One of many ways to get a G major chord on a guitar is to strike a G, B, and D at the same time. Overall, the G sound is what prevails, but if you use a subtle ear, you can hear hints of the B and D.
Some would argue that the guitar part in Led Zepplin's Kashmir is the hardest for anyone to remake exactly, but because the bass and guitar are hard locked together in making the sounds. Some will argue that there is no bass in those riffs, and some will hear it plain as day. You just have to get yourself tuned in. I'm not sure how one can assist someone else in tasting these notes, other than to tell them to practice tasting, and use your imagination to lock in on specific notes. Then we give them names like incense, grapefruit, etc... just whatever is the closest to compare the notes to.