Very good point Henry, I didn’t think to clarify that when I gave that example.
Redesigning for the sake of redesigning isn’t really going to solve anything. Although, I do think that with the right information and clear goals a certain confidence in accomplishing them should be present. Enough to give a personal guarantee? Depends on your bravery and the scope of the goal.
I don’t think the we’re (designers) going to get very far if we can’t give guarantees on our work…
But yes, it should definitely be discussed and clients should know exactly what to expect.