Boxing inconsistency

There's an inconsistency in boxing when it comes to training methodology and actual application in a fight. I often see combat sports athletes criticize traditional martial arts for this (often rightfully so), but then not see it in their own training.
The links mentioned (affiliate link):
- Book: "Boxing for Self-Defense: Taking the Sweet Science from the Ring to the Street" https://amzn.to/3Evywwb
- Freddie Roach teaching the left hook: https://youtu.be/vmAFFvdGc_o
- Tony Jeffries teaching the left hook: https://youtu.be/9OL0Mt0La6M
- Tony Jeffries fighting: https://youtu.be/osuhFXosGw0 Spot how often he throws the hook as shown in the previous video...

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