What? Prototyping is often the easiest and most fun part of projects. Often a prototype taking 1-2 people a few weeks turns into an entire team fleshing it out full over the next year or more. Thats a lot of risk if it goes wrong. Theres usually very little risk in prototypes going wrong, thats one of the main reasons to have a prototype phase to begin with.
You make one prototype in a few weeks with a couple of people then call it a day and start fleshing everything out???
Dude, it might take a few weeks to work out if a big project is even viable in a large company.
Prototyping a full product is not the easiest part of the big project by a long shot. Prototyping is when you find and create the constraints, reduce the chaos and make the project legible so other people can work on it.
If you do it right, it should make it easier for other people to work on the project not harder.
