A stroke damages tissue in one part of the brain, and what changes afterward depends entirely on which part. That is why no two recoveries look alike, and why comparing yours to anyone else’s tells you very little. Muscles may not activate on command. Others may activate too much and hold tight. Sensation may report back inaccurately, which leaves balance with less to work with. And movements that were once automatic, standing, stepping, reaching, have to be run consciously again.
Physical therapy does not undo a stroke, and nobody honest will tell you it does. What it works with is the nervous system’s ability to reorganize around what is still there, which responds to specific, repeated, meaningful practice. So the job is to find exactly which part of a movement is failing, and practice that part, at the right difficulty, often enough for it to count. We also work against the habit of leaning on the stronger side, because the less the affected side gets used, the less it turns out to be able to do.