you're right that a good idea should be able to survive scrutiny. The issue I'm describing isn't "someone asked a tough question". It's when objections pile up so ast that nothing can survive long enough to be properly evaluated. That's not a rigorous process, that's just a kill zone. The difference between a productive and unproductive kill zone comes down to culture. Teams that default to "here's why it won't work" end up very efficient at producing nothing. The teams I've seen do this well still kill ideas but they just do it after giving them a fair shot. The proposer has to do their homework but the environment has to let them get far enough to do it.