I've experienced the effect of the rarified air at a 9000 ft trap shoot where a skeet choke would break birds out 40-50 yrds. But that effect applies to all chokes.

If constriction is meaningless, guns should be bought with the maximum choke safe to shoot and the shooter should have them openned to his desired effect. That ain't the case cause a .010 choke performance in a modern well built gun will provide pretty predicatble results. Not 'count the pellets, it's a IC by the book' results with all loads, but a result that can be reasonably predicted with most ammo.