LMSC I see flavour notes like ‘markers’. For roasters, I guess that can help suggest that a fresh batch is still the same as the last. For the me, it’s something to help guide what I’m ‘looking’ for, but as others have said, if I get to a good cup and I don’t get any of the notes, I won’t keep searching - I need a ‘hint’ of something to bother going further in refining the recipe.
Mostly, ‘tastes good’ is enough, if there’s no real direction to pursue further.
Of course, the elephant in the room - if there weren’t any taste notes, how would you market your beans as being different from others, other than light/dark, how ethical it is, or what the ‘cup score’ is (another finger in the air that likely is more ambiguous than flavour notes).