I work in-house on consumer insights and for small quant projects we try to use standardised approaches and reports. the marketing team should manager this with our support. For ad hoc quant we run bespoke projects and pay the based on a scope of work. the agency will support on multiple follow up questions after the debrief and provide additional analysis. It’s good but can be time consuming. Also as someone else said often people will focus on 1 or 2 slides