In deeed, i even think footwork is more important than hand skills. Without footwork, no hand skill can save your but.I can get a sense of how good a player is without seeing their stroke technique: all I do is watch how they move. Crude but surprisingly accurate. Certainly for well-trained players. But even those with limited mobility: they know how to position themselves optimally.
No, footwork is not the least of their issues: if they could improve their footwork, even poking at the ball with no TS would become a lot more effective and consistent.