The only problem with this analysis is that in practice a lot of the designers don't understand the customer and don't understand the business. Don't understand the market, at least compared to the founders or people who've been in the space for a long time. So there's a bit of a false confidence where the designers think they know what's really right because they did "scientific approach". But in reality the founder…
Most designers are designing for their customer, their customer is the one paying their salary/commission/contract.