Making every recommended call when one is the only aircraft operating on the CTAF is a bit like using your indicators on your car when making every turn at 3am with no other cars around !
There is a difference - using indicators in a car will NOT blind other drivers from seeing you or someone else.
However inbound/overflying and taxying calls are essential at all times - these tell any other pilots that "I'm out here", "I'm monitoring the frequency", and "Broadcast at appropriate points if you could be in conflict". In hilly areas where terrain shielding can occur additional calls are essential as a taxying/circuit/departure aircraft may not hear an inbound/overflying aircraft.