An interesting comparison with which you can only partially agree. Bitcoin and ethereum are indeed the main ones in the world of crypto currency and while they retain leadership. However, it must be borne in mind that ethereum separated from bitcoins and, with this in mind, compared them as king and queen is not entirely correct.
I completely agree with you that the etherium and Bitcoin practically do not overlap, because Bitcoin pays for itself, and the etherium for itself and for the rest of the altcoin.