Another major plus is that SBIR's don't have to be the next google. You can get funded for a product with fairly mild potential. VCs only seem to care about the 100x investment.
You're right that it takes time in many or most cases to get funding from a VC - but they can write a check the same day - that was my point. And there are a lot of them to go pitch your idea to as well.
which usually resolve in a x100 ROI, but that’s a random byproduct
Also, most of the times far fetched things require a lot of time and money by it's own virtue because they're hardware and require long basic research. See for example as of recently: BOOM.
We're not talking about seeing if there's demand for a piece of software.
Why do you have to reach consumers at the ideation stage if
> We're not talking about seeing if there's demand for a piece of software.
?