When we have an area of expertise and people come to us seeking our advice, it is natural to want them to take advice possibly with minimal explanation as to why you are suggesting a particular action.
But some people need to understand the ins and outs or something thoroughly. It doesn’t mean they don’t trust you. Indeed, if you take time with them and do not make them feel poorly for wanting the answers, they may trust you more in the end than the average person.
“Experts” are probably wise too acknowledge and recognize this. Though it is no easy feat!