We say no to plenty of ideas, often while the founder is sharper than average.
Respect for budget and time comes first. Software pays back when the beliefs underneath it face real users early enough to still change the plan.
Calls that jump straight to headcount and a go-live date already assume the build is certain. The harder and more valuable question stays open: will people change behaviour enough that someone funds the change? Will they pay? Will they return without a discount ladder?
I have walked away from meetings with a strong team and a real market because nobody could spell out what they would prove in the next few weeks with a prototype someone actually used. Small idea is rarely the issue. Missing proof sequence is.
What makes us lean in: a problem with real friction, messy demand signals people already fund with workarounds, and a founder who can sit with "we might be wrong" without drama.
Name the risk hiding inside your feature list. Touch it cheaply: narrow interviews, concierge slice, clickable prototype, single-region pilot. Then size the squad.
Multiply force only after you know what deserves multiplying.
Starts from: Why we don't build every idea that walks through the door (resources hub).
If you had to prove one behaviour change before you funded engineering, what would it be?