That's because all athletes, irrespective of their sport, use barbell squats to get strong. Their numbers are in the millions.
And literally nobody but retarded RKC and StrongFirst followers try to get strong doing pistols.
Millions of pro athletes barbell squatting vs. a few dozen of nobodies pistol squatting.
I seriously doubt you can out-pistol Ido Portal. And he clearly stated that barbells are the go-to for the lower body.
No sprinter, no long distance runner, no high jumper, no pole vaulter, no rugby player, no basketball player make pistols their main leg exercise. Ask yourself why.