Comment by tsar_nikolai

You see someone struggling while trying to solve a problem, and you know that –in your opinion– there's an obvious solution to that problem called [𝓍]. The thing you're after, is whether they have considered using this solution.

Just ask them:

=> "Have you considered using [𝓍]?"

Either you will learn something new (why [𝓍] is not suitable for this situation), or they will (there is [𝓍] that solves their problem).