Talk to your customers, but leave room for your vision. If the customers knew the answer it wouldn't be a problem.
Problem --> we want to get faster from point A to point B
So yeah, if you ask them the solution (not the problem) then you might get such response.
That is why YC teaches you to listen to the problem then come up with you solutions.
I would like to have a faster airplane, but probably there is a guy with a teleport somewhere.
Turns out a cruise ship designer came up with it in 1999.
Sure if you ask your customer for solutions, you'll get "faster horses". But or course that that would be silly - you aren't talking to them for solutions. You are talking to (hopefully lots of) potential customers is to understand their problems really well.
The road to startup success is littered with the bodies of companies that had a neat solution to problems nobody really cared about. Sometimes really neat technology. Still dead.
If your business approach is a solution looking for the right problem, success is going to depend a lot on timing and luck; i.e. things you cannot control.