“What engine did you use” has the same energy as “what programming languages do you know” – actually they’re the same question!
It doesn’t matter, what matters is the core concepts being implemented and showcased. One should be able to adapt those concepts to any tool.
Engine might be relevant if you’re interested in analyzing the game on a technical level, say, for modding. As a programmer myself, I often do that. It’s not always a useless question, but its only not useless in the context of something technically interesting that the game does.