> you need one person to work by themselves really really quickly to ship and create the foundations

This is literally the secret of every successful project I've worked on. An individual, with high agency and low communication overhead has either been trusted to take the task on themselves, or they've done it secretly to side-step the approval process and organisational overhead. When the foundations are in place it's relatively easy to add engineers, but starting something from scratch with a bunch of people? doomed before it starts in most cases imo