When the “what” and “why” is pretty obvious

Does anyone else struggle with communicating or conveying what we need to do (fix) and why when those 2 are pretty obvious? I’m not talking about during the beginning or at the start of the first few discovery cycles. Not even for new products. I’m talking about after we’ve already have a shared understanding of the major problems to solve in already existing products. I find myself having to over communicate or even be extremely explicit and speci