You might refine the solution you came up with to match the problem, but you might invest a lot of effort building the wrong thing while a simpler, more obvious solution is right under your nose. When you pick a solution branch too early, you might be tempted to stick to that branch, and only notice the parts of the problem that fit your solution.

In your example, you might build the wrong thing based on your assumption of what your users want. You might realise at some point down the road that software wasn't even the right solution in the first place.