I'm not sure what you are trying to say here.
I have not had any fail from them. It's a genuine Delphi. I've had a more expensive Carter pump fail and it had no warranty. So I was out the time and effort to go recover the vehicle, plus the time to replace it, plus the cost of the new pump because it wasn't under warranty.
If I had just put the autozone Delphi unit in there first, I likely wouldn't have had the failure to begin with, but if I had.. I could have just gone down to the nearest autozone and swapped it out in their parking lot in 15 minutes and not needed to pay for the part on top of everything else.
Now, if I'm a shop mechanic and I'm in a fixed location... then I have a relationship with a local supplier and it's a totally different conversation. If I'm driving this thing all over the place, I pick a supplier that usually has one in stock and will stand behind their warranty nationwide.. no questions asked. The only store I've ever had do that is Autozone. Advance and Oreilly are almost as prevalent nationwide, but their computer system sucks and their warranties are terrible to boot. I've had multiple instances of Orielly not showing I bought something or not tracking parts purchased through a store. NAPA is great for a single store that you know the guys at. If you have to do anything anywhere else they might as well be completely different places.