That's how you run a large corporation. Not a successful startup or moonshot project.

It is perfectly valid to ignore a risk and then assume you'll figure something out if it comes to pass. Few things happen quickly so you'll have time to talk to other founders and investors and so on. Or maybe you'll fail and then start a new venture in six month. Trying to plan for mitigations ahead of time will mean you spend all your time on mitigating risk versus growing the business. A climber that does that is a corpse.