This is a complicated decision. Older players like to have to read and look for clues.
Today's players want everything indicated, if possible with icons that take up half the screen, lest it becomes unclear to them.
No matter which system they choose, neither one nor the other will be happy :D.
Personally, I like to do my own research. Maybe you can have the main quests marked, but there are other hidden quests that don't indicate where they are and give you better rewards (better pieces of equipment, more xp or more money, for example).