I think it is a good thing when a T thinks that they don't have enough background in a particular thing. T training varies quite a bit by discipline and by school and by year(s) T is in school. Professional humility is a good thing IMO; many professionals, T or otherwise, have about as much humility as a grizzly bear. If a T thinks that their background and/or skills won't be helpful o you, it seems to me that they shouldn't try to take your money and not help you, or worse.