元音有韵，辅音无韵。is a fundamental phonetic concept. Since HYPY barrowed English alphabets as its symbols, it should stick to the separation of the "names" of the letters and the pronunciation of the letters in spelling. The name of letter "b" is "bee", but the pronunciation is very short bursting solid sound of both lips, without any "vowel" involved. When teaching 辅音，all the material pronounced either with "e" or "o" rhyme. Wrong! Unless you remind your students that you are introducing the "names" of the symbols, followed by the right pronunciation in spelling, i.e. 辅音无韵。 Thus 歌 is rhymed, must be spelled "ge" as "e" contributes the rhyme.
Is it that the teaching method is so authoritative that no one ever pointed out its flaw? BTW, what's wrong with 声母 and 韵母 that they must be changed to 辅音 and 元音？