Starship lets you trade money and mission complexity for time. A fully refueled Starship in LEO should have around 5km/s in an expendable configuration. A gravity assist from Earth or Mars typically provides 2-5km/s. Looking at the https://www.reddit.com/r/space/comments/1ktjfi/deltav_map_of... 5km/s from LEO is barely enough to reach Jupiter. Looking at the mission trajectory direct launch would shave off roughly 2 years from 5 year mission - https://europa.nasa.gov/mission/timeline/
You could also launch much-much heavier probe with a dedicated boost stage and / or electric propulsion...
You could also launch much-much heavier probe with a dedicated boost stage and / or electric propulsion...