I would have to agree that recognizing heart sounds does not do much to change your management.
CHF? Hearing or not hearing an S3 isn't going to change your management any more than hearing crackles but not seeing any JVD.
Endocarditis? Hearing or not hearing a murmur probably won't change your management because it will only be support for suspicion based on history of IVDA, RHD, whatever.
I've also wondered if auscultation of the heart is becoming a lost art based on new technologies. Sure you get cool findings sometimes, and it often supports a diagnosis, but i've never really seen it CHANGE management.
I'm sure someone can sight random isolated examples, which I would be curious in hearing. Just wanted to share my sentiments with the OP.