Why would landing a spacecraft on the surface of Jovian planet be difficult?

Despite the belief that Jupiter is a gas giant, the clouds actually hide a dense rocky core that could be 20 times the mass of earth, but that doesn't answer the question, the answer (or at least what i have researched) is that the gravity of both planets is much denser than earths (Jupiter's is 2.5 time that of earth and Saturn's is 107% that of earths, so any spacecraft we make in a long long time will be crushed like a soda can practically as soon as it lands