That's true ! Furthermore, ALL coax interconnect cables should all be as short as possible.
This stuff you constantly hear about needing all cables to be 3 feet or 8 feet or 16 feet or whatever is the single biggest bunch of snake oil in the CB hobby. If everything is done right with the antenna (including having a proper balun), and the radio is installed properly and hasn't been golden-screwdrivered (also known as peak and tune), and the amp is biased properly and has an LPF behind it, then the length of cable shouldn't and doesn't matter.
This might be hard to attain in a mobile setup where every antenna is a compromise antenna, but it's not so hard to do it on a base station setup.
The reality is that if changing the length of a cable changes the SWR or changes the signal strength or makes the amp chatter or stop chattering or whatever, then there is something wrong somewhere, and fiddling with cable length to make it happy is only putting a band-aid on the problem rather than addressing the actual root cause.
Of course, in the world of CB radio we deal with a lot of compromise antennas, tweaked radios, unfiltered amps, and all the rest of it, so it's not too surprising that so many people DO have to mess with the length of their cables.