In the days of component video, I made custom cables for everything except power cords. I made do with the OEM power cords. At first I used coax, then found planet wave which made it much easier. HDMI though started to change that.

At the company I was with until recently, when I made custom analog audio cables with planetwave. And we used premade HDMI and cat6 patch cables in various sizes. Usually in approx 1’ 2’ 3’ 5’ 7’ and 10’ lengths for cat and the closest equivalent metric sizes in hdmi cables. The company I’m with now does much larger jobs a uses all premade cables. I’m with Mac on this. Custom cables take too much time and it’s not worth it for that look. With proper wire management I can get very close to just as good of a finish with premade cables.