By working to understand and solve the problem that seems easy on its surface, either:
1. It ends up harder than it seems. The original poster gains a better understanding of what is preventing the originally proposed solution from working, and is in a better place to judge what needs changing, and generally everyone wins.
2. It ends up as easy as it seems. Not much time is spent, the original poster makes a valuable suggestion in the form of a patch/PR, and generally everyone wins.