Firstly, you're either vastly overestimating how good you are at scanning every single gap and new space while also taking in the rest of the traffic, road conditions etc, OR you are the most incredible driver to exist and your brain should be studied by self-driving car companies for their software.
Secondly, and this is the simplest way to show that you're incorrect:
Average driver reaction time is 0.75 seconds (that's to see something, and move your foot to the brake pedal and begin to hit it). At 20mph, you've travelled 22 feet before you even begin to slow down.
And that's a generous reaction time. This article puts it at 1.5 seconds for unexpected side-incursions: https://www.visualexpert.com/Resources/reactiontime.html
You've now travelled 44 feet before even hitting the brake.
If that gap you're looking at is behind a tall vehicle and we're talking about a kid or a dog, you're along side before seeing the entire gap. Your back wheels are hitting that sprinting dog well before you've even touched the brake pedal.
I'm starting to think you're either making shit up just to argue, or your overconfidence in your own driving is actually making you more dangerous on the road than safe
Just go double or nothing a few times! Simple!