Exactly. Why has NASA been dragging their feet? They have been studying this mission for 10 years at least without funding it.
It gets proposed, but every time a proposal takes a serious look at how expensive it would be, the funding isn't there, and they are asked to scale back.
Jupiter is hard. Jupiter is nearly a billion kilometers away-- Mars is hard, but even at its furthest, it's only a quarter billion kilometers distant. Compared to Jupiter, Mars is easy. Jupiter also has a huge gravitational potential (which makes it hard to stop when you get there), and that doesn't even get to the issue of landing on Europa once you get there (no aerobraking nor parachutes for Europa!) and the difficulty of penetrating the ice.
Clearly the first thing needed is just a probe that can take a deep penetrating radar to the system and find out just how thick the ice over the interior ocean of Europa is, and whether there are places that are thinner than others, and whether cracks go down all the way to make an easier route to the interior. That would be a lot easier than actually trying to land, much less access the ocean... but even that is not at all easy. When you're in Jupiter orbit you're having to operate in a ferocious radiation environment.