I recently put cable TV in my room (we already had cable TV before, but not in my room). The technician from my TV provider, through a split, ran a coaxial cable up to the TV in my room. When he did this he did not measure the length of the cable or anything like that, in fact, on the contrary, he told me that he could run the cable wherever I wanted and so it was. He also did not measure the impedance of the TV (i.e. the impedance of the load) and, in spite of this, the TV looks fine and everything is functional.
It is not a particular issue of the technician, because I have always seen that all technicians work in the same way.
Why don't they need to measure these parameters before? Wouldn't it be convenient to measure these parameters to verify that the line is correctly balanced? PS: My TV is not satellite.