Lucifer I think you are wrong, you are advocating cluttering up the frequency with unnecessary transmissions, might work at MAN but just try not reading back the precise R/W designator at somewhere like ORD or LAX, try getting a word in edge ways for that matter.
If the read back is correct in the first place then there is no need for clarification and to leave out the L, R or C, (Jeddah etc.) is very unprofessional and incorrect R/T.