A question that completely changed our customer interviews

Early on, we'd ask:

"What features do you want?"

The answers were usually long wish lists.

Then we changed one question:

"What's the most frustrating part of your day?"

The conversation became completely different.

People stopped talking about features and started talking about repeated tasks, broken workflows, and information they couldn't trust.

Ironically, many of the features we thought were important never came up.

That one question has influenced almost every product discussion we've had since.

I'm curious...

Has a single customer question ever changed how you built your product?