I've done this on quite a few occasions as well. It isn't necessarily time wasted, as you evoke a positive view from the client (progress towards the solution)

I've done this on quite a few occasions as well. It isn't necessarily time wasted, as you evoke a positive view from the client (progress towards the solution) and often get valuable feedback. The alternative is that they think you are done, adding more pressure, and requiring more wasted time later explaining the mis-aligned expectations.