Why is telling time hard after a stroke?
Reading a clock combines several skills a stroke can disrupt: reading numbers, judging the positions of the hands, and using time language. Any one of them wobbling makes the whole task hard.
Digital clocks are fine — why practice analog?
If digital works for you, use it — that's smart adaptation, not cheating. Practicing analog is still worth it: wall clocks, watches, and clocks in public spaces aren't going away, and the underlying number-and-language work carries over.