Have you seen cable (bulk) fail? What do you buy, pre-made or boxes/rolls? Do you strip off some of the end at the start of a roll or box? I just had a pre-made cable fail- not sure why, since it has absolutely no signs of damage.
Been at this 30 years. So I've seen about 95% of what is out there to be seen.
When I was doing work for a hospital system they had two LV companies. One I would have to go into the switch after installation and things had been running for a week and look for CRC/FCS errors and have them go out and replace the crap, no name, patch they were installing.
The other outfit was a bit more expensive in the few % points, but they used Panduit 28AWG (thin) patch and never had a problem.
I don't do layer 1 stuff. I just call our low voltage people in and they run and certify. In a pinch I have termination tools.