I think very long runs (> 50 feet) of unbalanced interconnects are not favored.
I personally would have no problem with a 17 foot single-ended interconnect run. If the length of my interconnect run were 17 feet rather than about 55 feet I personally would not use balanced interconnect.
My experience is beyond 6 feet simple 2 cond se is at its max. Beyond this you loose sound and and pick up nose why is simple. now if you use let’s say a Mogami bal cable fitted to se you can of the the Shield is used correctly yes it’s good.
I think before going out and talking about sound quality etc. the first thing that should be checked is if the cable is able to send the signal between 20hz to 20khz without loss. This would be the minimum requirement.
This depends on the output impedance of the source you are connecting the cable into, the capacitance and the length of your cable. If you know all three, you can actually calculate the -3db point. I think this often overlooked part should actually be the first thing to check and should be a minimum requirement. There are even online calculators to help you do the maths. for ex. http://www.sengpielaudio.com/calculator-cable.htm
If anyone specifies a length and says it is ok or not, that would actually just tell you their personal experience and has no application whatsoever to anyone if the setup is not exactly the same.