Flexibility is a nice property of a system, especially in uncertain domains.

But flexibility is not free; it can be extremely expensive to create.

One way to create flexibility is to design a system that can do anything at all in theory.

Sometimes this theoretical flexibility is extremely expensive to create, and you block doing anything else while you try to build it.

Another approach is practical flexibility of being willing to have a high rewrite count.

Try something you know won't take you where you need to go and will only work for 6 weeks or so, to start absorbing knowhow and relevant insight to help you improve your accuracy on the next iteration.

That bar is much easier to hit, by orders of magnitude, and allows generating hte all-important momentum.