Other than what Muslims always said this, I think its a matter of recognition and acknowledgment for all the hard work of the beloved prophet (PBH) who spent His life for making our hereafter better by showing the right path and introducing the Allah to the world. He doesn't need any thing from us however its our obligation due to all his love to us. May Allah fills our heart with His and His beloved prophet(PBH) love(unconditional). Ameen
Sorry if i can't able to convey my thoughts properly and hurt you by any means.