Yeah I use Jupiter as a nuke for crowds and to turtle up on some enemies, but it's a forced play style for fun. It's almost completely unnecessary and using projectiles and movement is usually far more effective.Late to reply but there aren't many sections like the tunnel Jupiter training bit if that is what you're referring to. I think Jupiter needed more work. As is, the concept is fine but I think most of us were in the other forms and only used jupiter primarily for slightly faster island travel.
It's super fun to use in toe-to-toe matches with Kali though. "Try to knock me back now!"