An ex player & coach I know (played champions league and capped nationally, youth coach and now coaching a pro team who won their domestic league) used to crack up at the juggle infatuation. Sure you should be able to keep it up a few times, on each foot etc., but its all about being able to control the ball when you receive it, esp. in tight situations, and then about being able to put it where you intend to put it, either short, medium or long passes - or in the goal. You should be able to do that with both feet ideally. He would ping 20 & 30 yard passes to the kids and land it at their feet every time, without exception. I saw him play 6v6, small goals and he scored for fun, not by beating players, just by banging it into the corner (any corner) every time, flawlessly - both knees were done, couldn't run very much, overweight and you could see he was a zillion levels above every other coach on the field despite all of them having their played in college or played "pro" (US) creds, and being a decade or two younger than him.
He never did 100 juggles in the life apparently ...