A pitcher’s physical maturity, physique and dexterity all contribute to the human anatomy in parts and in total, as he/she pitches. And when comparing pitchers, some pitchers, because of their heavy girth, can show little signs of any kind of discipline that can be nailed down - pivot foot or otherwise.
Taken one step further, a pitcher can influence his/her pitch a lot, by either keeping their pivot foot parallel with the leading edge of the rubber, or angle the toe towards a baseline, or even slightly away from a baseline. Thus a lot of body angles - torso and shoulder platfroms in particular, receive muscle and tension dynamics that can uniquely pass on a different movement and report 60 feet away.
Pitchers with an injury that’s being nursed will sometimes give little thought to the pivot foot and its role in getting back into the swing of things on the field. In every single case that I’ve worked with, a raised heel, a toe straight down very early in their stride forward means one part of their body is being favored over all others. Can’t be 100% back in shape without going back to basics.
There is however a tendencey to rush a pitch - sometimes, when the pivot foot is not kept parallel along the rubber. Raising the heel up too soon and pushing off the toe can place a bit of strain in the muscles along the pivot’s leg, and up the back. Some pitchers actually feel that this is preferred technique to their forward delivery by actually “launching” themselves. I hesitate to coach that way only becuase of the stress load that the entire body must endure, pitch after pitch. There’s also the tendency to attempt and finish an pitching arm cycle before the stride leg is completely planted and ready to accept the entire body’s weight. In any event, a good pitching coach with a keen eye for detail can prolong a career of a pitcher who favors this style.
If the position of your pivot compliments comfort and ease of control - so be it. Then THAT is as individual to you as is your own signature on a contract. So, start off with a solid foundation that gives you both control and balance all the way through your pitching cycle - THEN you can dial around for better reception to what you’re trying to tune in on.
Either way, your placement and discipline of that pivot foot is unique to you and you alone. Careful judging yourself next to a matured adult in the professional game.