Western SAM systems are, for the most part DIRECTIONAL, i.e., unlike the Russian S300 and later, they have a limited angle on which to act. The Russian systems go out vertically and then in flight, they take direction (360 degrees coverage).

This means that a Patriot battery, in a location like Dnipro, will have to have launchers pointing south, others west, others even east. Coverage is therefore less dense, and even easier to saturate by the adversary.

In this way the Yemenis, choosing poorly covered routes, attack Saudi Arabia, which uses Patriot systems (and that is why they want to buy S400s).

In the same way, the loss of a launcher system in the battery is a major damage, as there will be gaps in coverage.