jobo
Grandmaster
a million years ago when i dif jow ga, the instructor was very big on hopping, he said it helped the jump kick amongst other things, he would have us hopping round and round the gym, then he would have me do it,again with a,250 lb guy on my back, that was just me who got to carry him, everyone else got,someone their own weight or less, i don't think he liked me for somexrI don't train single leg hopping. We may have done it once or twice in class as a warm up but it's not something we train. I use other stance and footwork training that's a little more suitable for the movements in Jow Ga Kung Fu.
Not discounting it. Many of us skip rope for 30 minutes a day (skipping rope works more than the calves and ankles), do one leg & 2 leg explosion drills, on top of the other things I've stated. Is it something to do from time to time sure, ok, I get and drill my guys a lot on leg exercises as it is and most are multi aspect drills. That work skill as well as strength and flexibility.
For someone who doesn't do any other type exercises it is great.
If I had stairs in my home or office maybe I would do some extra stair hopping.
skipping is indeed hard, but as you say it works lots of things rather than hitting the calf muscle. If you watch someone,skipping at pace, you see that as much as jumping, they are lifting the leg over the rope, which hits the hamstrings, another much neglected muscle, but not the calf so much. This is why there are so many people with really skinny calfs, its near impossible to hit it hard other than hopping or walking on tip toes like a ballet dancer, and that is hard