Why I correct and add details to the Google Maps

My goal is to make data on the map more clear and accurate. For people who appears for the first time in the area some petty details might be useful.
For example you need to know open hours of the store at the evening to be sure you have time to visit it.
Sometimes it’s important to know additional contacts of the railway station or a medical institution.
So petty details help to navigate quickly, and absence of the details might complicate the situation.