What does a presales solution architect actually do?
They convert a customer's business problem into a technical answer that can be believed, priced and delivered, before any money has changed hands. In practice that is four things: running the technical half of discovery, shaping a solution that fits the customer's constraints rather than the ideal one, sizing and defending an estimate that delivery will have to live inside, and being the person in the room whose technical statements the customer treats as true. The deliverable is not a diagram, it is credibility — a buyer who believes the approach and a delivery organisation that believes the number. The cost of the role is that you are measured on a commercial outcome you only partly control, and the temptation that comes with it is to win by promising, which is the single behaviour the role exists to resist.