The next time a decision is being made, reflect on your newfound knowledge, and think of a question that can push others to challenge the assumptions that support their logic. If a certain feature is hard to build, ask how they would build it and where it would break. You may be able to provide additional context (e.g. the customer doesn't care about an edge case they are worried about). Or you may be swiftly shut down. That's okay! You will undoubtedly learn something new for the next time. Iterate.