Eventually for damping purposes. Place a payload in it, surrounded by the fluid, and high frequency shocks might be damped. Of course, damping properties might turn out to be not good.
If electronics are soft and rubbery, would they maybe also tolerate launch- or landing-related vibrations better? Could we pack things more robust? Probably things get too fluffy for space engineers?
I stop complaining about "useless" research such as infeasible invisibility devices... At least I start to understand why Italy is a country with one of the highest publication rates per researcher.