Executed agreements are final. You only need to process them once. Processing agreements is extremely costly; to do it pre-execution where the agreement has not been finalised and is likely to be changed means that you're going to have to perform an analysis several times. Couple that with a requirement for fast turnaround time, and you’ve got a recipe for low quality.
That’s why we love building a product that sits after the point of signature. We can focus all our effort on one outstanding analysis.