These PD testers are cool (I thought about buying one), but honestly, for the price of a tester, one can buy 2, maybe even 3 good quality cables and just throw away the rest.

Fair point, I just have oodles of cables (literally 10-20+ per combo of micro/mini/standard-USB-A/B/C <-> micro/mini/standard-USB-A/B/C each) and I like having them all organized by capability so that when I need one I can grab from right bin.

Before getting the tester I just kept buying new "known good" cables whenever I needed one since my cable drawer was just a huge unknown.