Teams do not usually waste months because the stack was wrong. They waste them because nobody owned a decision that looked small in the room and large in the model. You do not need every answer. You need the ones that change the shape of the work.
Decide the object, not the colour
If you cannot name the thing people will return to — an order, a case, a period, a record — the interface will invent it. That invention is expensive, and it is rarely written down as a decision.
- What is the object that must stay true after launch?
- Who is allowed to change it, and who is only allowed to see it?
- What is the first version that is still worth using twice?
- What will you refuse to build so the first version can exist?
Write the refusal
A brief that only lists features is a shopping list. A brief that also lists what will wait is a product. The second one is shorter, and it is the one a team can stand behind.
If the decision is not written, it will be made in the pull request — by whoever is least afraid of the silence.
You can change your mind later. That is not the same as never making one. Hire a team when the object, the permission, and the first useful version can be said out loud.