It's also important to note for broader context that pistols, despite the number of people who take pistol accuracy seriously, are not really designed for precision marksmanship.
For the use cases that really matter, you won't be taking well-aimed shots, you'll be trying to get rounds out of the weapon in the general direction of the threat as quickly as possible, in order to buy yourself some time and/or space.
The front sight rule is not just the best aiming mechanism for the reasons of geometry described in the article, it's also the quickest way to acquire a basic sight picture under stressful conditions.
While this is true in a sense, I suspect a great deal more pistol ammunition is expended in competitive shooting sports than is fired at people. People in speed-oriented pistol shooting competitions where optical sights are not allowed usually use a front sight containing a colored fiber optic that's easy to focus on quickly.
For the use cases that really matter, you won't be taking well-aimed shots, you'll be trying to get rounds out of the weapon in the general direction of the threat as quickly as possible, in order to buy yourself some time and/or space.
The front sight rule is not just the best aiming mechanism for the reasons of geometry described in the article, it's also the quickest way to acquire a basic sight picture under stressful conditions.