As said, most of us have our strokes, and only need a warmup to play.
Without the warmup, we can't find our stokes the first 10 minutes.
And without prior practice, all the warming up in the world does nothing to help us play well.
Like the serves before a match. I only need to hit a few, maybe 3. I already know HOW to hit it, I just need to warmup the shoulder and legs TO hit it.