- already exactly know where you want to go
- figure out the relative distance either by looking to the side at relative line numbers or calculating
- move your hands to the numbers row to input numbers and back (I don't have small hands, but that still translates into a small amount of arm movement for me).
Whereas just using repeat input on jklhwe... only requires you to have a rough idea initially and leaves you plenty of time to figure out where exactly you want to stop while you're already getting there.
Besides: I don't like to think about random numbers while I'm coding. Doesn't exactly make the cursor feel like an extension of my body (imagine you had to tell your hand "move 10 centimeters left")
Another quite intuitive way I navigate is using "/something" and cycling through hits - usually you know some text that appears near the area you want to go. That was pretty much instant muscle memory.