The terminator is always especially important if you take out the unused cascade connections with a cascadable multiswitches (schedule) want. The terminating resistor can also be used when one still has blank receiver outputs with multi-switches. No one uses this termination resistor, it can lead to reflections (interference) in the multi-switch. All other unused F-connector outputs (LNB, tuner ....) should impose a terminating resistor. Kathrein and other manufacturers recommend the use of such terminating resistors explicitly.
I take this terminating resistors for several years and am satisfied with the quality. A difference in not use I could not tell.
