For me, the needless thing I do in games is clear out the "fog of war" on maps. Granted sometimes doing this adds things to the map that is helpful, but for the most part you don't NEED to clear out ALL of the fog.
My most recent example is Ghost of Tsushima (great game). I cleared out ALL the fog of war from the map. You. Do Not. NEED TO DO THAT!
The markers for things mostly pop up in the fog by themselves, and you can just let the wind guide you to undiscovered stuff (evening picking which kind of thing the wind looks for you).
But for my first playthorugh, I just had to finish clearing out the fog. For the first two acts of the game on the first two parts of the Island, this wasn't too bad. Act 1 you want to explore anyway, and in act 2 you still want to explore the new parts and "grow you legend" so you can take on the tougher enemies. However, in Act 3 I had all the abilities unlocked, got most of the cosmetic items I wanted, and there were some spots I had to wait to clear cause I couldn't go there yet cause the location was main story related or related to the last quest of a ally.
Plus, there was just less stuff to get while exploring at that point, so a lot of the exploring was only walking around clearing the fog with fewer stops, and again by that point I've already made Jin as strong as he can be so while the random fights are still fun, they are a bit less rewarding than before. Basically added a whole day to my play time of the game just finishing to clear the fog of war. To be clear, I don't mean it took me longer cause I had to grind for experience, find collectibles, or secrets. I mean just riding my horse around while in the outfit that clears more of the fog added a LOT of time to my playthrough on it's own.
Again, you don't need to do this, I recommend you don't, but I just had to since I already started and it felt like the last patches of fog of war was mocking me while blocking me from seeing a nice clear map. However, you'll be fine if you just leave it there and just go wherever you need to go to play the story, side stories, and collect things. I just didn't like that how it looked on the map. Personal issue. xD