My $.02...
HD uses the Dannaher Business Model, Lean/Six Sigma whatever you want to call it. The idea is to remove waste...not a bad thing however it does cause issues. Toyota is an example.
In the boating industry, when fiberglass was first used for hulls they overbuilt them tough as can be. Just look at the hull of an older vintage Pearson sailboat. That was a thick hull. As time progressed manufacturers realized they could get away with less and less material. They could add coring and do lots of other things to reduce waste and cost. The production fiberglass hull of today will meet spec. No longer is it overbuilt.
HD has done the same thing in different ways. Fiberglass bags & fairings were replaced with plastic might be an example. Accepting Questionable paint at inspection could be another. I am struggling for other examples but maybe the vendor chosen for oil lines is another. This actually could be a good one that could be synonymous with the fiberglass sailboat example.
Assume that for years people put in higher pressure fueling oil pumps without issue. But then, unbeknownst to anyone, HD changes vendor for oil lines that still meets the spec but unlike the previous vendor does not overbuild them. Now, you could have more lines breaking. This is just a hypothesis...not supported with evidence.
/Bill