If somone wants to purely teach grammar/linguistics at a university level then YES, I feel they should have a releavant degree in that that field. That is what I mean. If someone was only teaching oral English a degree is not needed. However, even at Chinese public universities with oral English courses there is sometimes a liitle bit of grammar to explain. The textbooks I was expected to use thirty or forty per cent of the time did have sections in regard to grammar. Sometimes I would have to explain points of grammar. The linguistics degree came in handy on those infrequent occassions.

We accepted that you didn't/don't believe "degreeless heroes" should teach specialist aspects.

I am getting very confused about the 'linguistics.' I thought I understood the word but it appears that i do not. Can you help me out here ,please by giving me a few sentences indicating what you would teach in a Chinese university if they employ you to teach linguistics? Like for example some mock exam questions for a student? It all seems shrouded in mystery to me, as it appears you don't have to know any grammar or even have to construct an English sentence properly. Can anybody help me out here ,please?