Compare handwritings -yours, mine, anyone else for that matter, and you’ll find slight variations, even when spelling the exact same words.
We all have different internal clocks, that “just feels right at this or that moment”, and so on. So try not to employ a cookie-cutter style or process to your work. Your pitching style compared to anyone else can be different as night and day, like a side arm delivery compared to the three quarter or others.
For one reason or another, the current thought of the day is to be “exactly like …” In other words, you MUST do it this way, you MUST have your body in this postion prior to, you MUST be in this positon after this or that, and on it goes. The fact of the matter is that there are some points of body movement that are better than others and there are proven methods and techniques that can generate better results than others - even safer ways then others. But don’t carry all of this “thought process” over the edge with … the only way.
Different stages in life, different body builds and physiques, even differences in personalities, can impact how you pitch, learn to pitch, imprint a signature to your style and pitch inventory.
Good question though.