If it works out for more that's great but it's not expected or necessary.
I've traveled with some people who seem focused on just getting pictures in front of as many things as possible which seems a poor way to really take in a place.
I think that's a good plan. I do tend to book hotels, planes, and usually longer trains. But, especially for a longer city trip, I loosely map out--even if just mentally--things I want to see and do but, for example, one museum a day is mostly enough unless another convenient one is small.
My firm rule is - have a loose plan, aim for one activity per day, an emergency option, or two, if the weather plays up, and that's it.
It's the type of plan that has worked for every holiday that I have taken that involves a different city to the one I live in.