As someone who hasn't owned a mobile apple device since 2012 or so (my ipod touch still had the old wide port that predates thunderbolt), my expectation of friction for a cable is essentially just that it requires more force to remove than you would normally exert by moving the phone itself.
This sounds snarky but I'm genuinely interested in the different perspective - is it a normal thing to hang your iphone off the cable to move it around?