I would never discourage a guy from practicing, but I guess I am in the minority of some of this. I do shoot off a chair on my deck occasionally just to have the feel of being on a stand. But when I went back to trad 25 years ago it was all about the ease and fluidity like my athletic days of basketball/football.
I realize there are fundamentals, but when it comes to hunting I have never worried about "bending at the waist" or whether a deer was standing or moving, etc.
I mentioned in a post a few weeks ago that I harvested a buck this past season from a stand as I drew my bow while slowly squatting from a standing position to one knee, leaning my butt against the seat support, shooting under branches out about 18 yds, while the deer slowly walked at 25 yds. Not sure I could have ever "practiced" that shot.
I am sure there is technically a difference, and I probably compensate in some manner, but I honestly have never found a difference from a tree or on the ground. I sure do not think about it and the deer have not noticed!
Just some thoughts. . .