MVP development, done properly, starts with a shorter list than the one you arrive with.
A first version exists to test the assumption your company depends on — that somebody wants this enough to pay, sign up, or change how they work — and everything on the list that does not test that assumption is cost without evidence.
The most expensive MVPs are not the ones that fail; they are the ones built so large that finding out takes the whole budget.
So the first working session is a cut, not a kickoff. We go through your feature list and argue each item back to the assumption it tests.
What survives gets built. What gets cut is parked until a real user asks for it.
A vendor that accepts your whole list without argument is pricing effort, not outcome — the bigger your scope, the bigger their invoice, so nothing in their model rewards telling you a feature is premature.
A fixed fee against a fixed scope points the other way: the only route to margin is finishing, and a tight scope that launches beats a large one nobody finishes.