Sure, I'll agree that there may be times when the "extra" caution is unwarranted by the situation at the intersection. But by doing this every time I ingrain it as an automatic habit which greatly reduces my ongoing risk of failing to use extra caution at some point where it is warranted!

Since the failure mode is an auto accident and the cost of the habit is marginal I feel comfortable promoting this behavior. I have definitely seen accidents and many near misses caused by people who failed to come to a complete stop and look around when conditions did warrant it.

Another lesson I learned in driver's ed is that traffic approaching from the left can be traveling at a speed that completely synchronizes with the A-pillar of your moving vehicle, causing it to be completely invisible to you right up until the moment it collides with your front driver's side fender. This is why I stop and move my head around while I look, to make sure I'm not missing anything. I'm just a stupid human after all.