Except every time you come back into the hab there is the brown soot that you can't get off your boots so it gets tracked everywhere...

But seriously, about the water ice. Yes it is easily available on the surface, certainly more so than say the Moon, but in many places it is buried underneath a lag deposit of [insert non-ice component name here]. So the easiest exposures are on steep slopes.

It’s also been almost 23 years since the last Galileo flyby of Europa. Yes, Galileo had higher resolution cameras, but Juno has things like MWR that can actually due ice-penetrating measurements.

While the SRU didn’t start out as a science instrument, it is officially one now in the extended mission. Higher resolution than JunoCAM and more sensitive so it can take pictures in Jupiter-shine that JunoCAM can’t really do.