Is it normal that many voice teachers are quite vague?

I feel as though a lot of the teachings are very technical the way instrumentalists are. Unfortunately that is the way our instrument is designed. However, I feel as though many teacher speak from the perspective of already knowing. For example, one teacher says to place sound back and up. Although this is a cue that might be that simple for him, support, vowel, larynx all need to be there too. I've had many teachers btw and it ranges from some teaching 0 technical work.