The carousel made the case: most founders skip the first questions of building a business, and skipping them doesn't remove the answers, it just delays them. This is the longer version: the four questions, and what each one is really asking.
Where are you going, and is it feasible
The first question is where you're going, in numbers you can measure, three to five years out. Annual revenue, customer count, what a normal Tuesday at 10 a.m. looks like in year three. Without that specificity, every step is reactive: the day stays open to whatever feels urgent, and urgent is usually just the loudest thing in the room, and the loudest thing is rarely the most important. A vision that doesn't change what you do today is just a wish.
The second question is whether what you want is feasible in your industry. The question is whether the path exists at all, easy or not. Are there people already earning what you want to earn, doing what you want to do? If yes, the path exists and the work is finding it. If no, it's worth adjusting the vision before you spend another year building toward something the industry was never going to support.
Do people want it
The third question is whether people actually want what you offer. Most founders skip it and assume yes, because they find their own idea compelling. The market is the only answer that counts.
There are two kinds of demand, and they're very different bets. Differentiation of existing demand: competitors exist, the market exists, you find a slice they serve badly. Or creation of new demand: nobody's paying yet, and you have to teach the market the category even exists. A quick test is to tell five actual prospects exactly what you offer and watch their faces. Clarifying questions mean the position is unclear. "Huh, interesting" means demand is uncertain. "Tell me more right now" means demand is present. Differentiation is the lower-risk path. Creation takes longer than you expect, costs more than you expect, and usually fails before it breaks even, so pick it with eyes open and fund the runway for it.
Are you patient enough
The fourth question decides whether the first three even matter. Do you have the patience to see it through? Many of the most valuable moves take 18 to 24 months to pay off. Quit at month six and you lock yourself out of them.
Most people are patiently impatient: slow to start, then in a hurry to finish. The ones who make it run the opposite way, quick to start and patient to see it through. Most founders skip all four questions because the answers might be uncomfortable, but skipping them doesn't change the answers. It just moves the discovery to two years in, after you've built on a foundation you never checked. Same answer, much higher cost.
A way to run it
Write down where you want to be in three years, specifically, in numbers. Check the top earners in your industry; if your target sits above the 75th to 90th percentile, you're betting on being exceptional, so make that bet on purpose. Then test the offer on five actual prospects, and be honest with yourself about whether you have the patience the plan needs.