What is this house actually for?
The question sounds elementary and is answered badly more often than any other. A house's purpose is not its category, its founder's biography or its current aesthetic. It is the reason a customer would choose it over a competitor whose product is comparable in quality and price.
Answers that survive contact with the market tend to be narrow and slightly uncomfortable, because a genuine position excludes people. Answers that fail tend to be expansive and agreeable — the kind that no one in the organisation objects to, and that consequently constrain nothing.
The practical test is whether the answer generates refusals. If a stated purpose has never caused a house to decline a profitable opportunity, it is probably a description rather than a strategy.