I noticed in Muay Thai fundamentals, in Regular Jab they tell to push heel of right foot, to get the extra range power from Orthodox. In Book "Muay Thai Basics: Introductory Thai Boxing Techniques" and many resources incl Silva and others
https://youtu.be/85wRhMbdw6Q?t=74
https://youtu.be/Ejz9HJHQZag?t=31
In Regular boxing they do not recommend leaning forward on regular jab. "Leaning too far back or forward can tip the balance" as heard from many coaches.
https://blog.joinfightcamp.com/training/how-do-boxers-stay-balanced/
Is there a reason for the discrepancy? just curious, my theory is Boxing is much more jab punch heavy, so doing it continuously can cause balance issues. Any insight is good.