Does it matter if it's "degradation" or the chip already ships not working? The end result is the same, 4% of the chips are unusable day one, vs 2% of the chips being unusable after months or years.
You understand puget is running both intel and amd at default settings? Do you understand that what's im talking about? That when run at those low safe settings for both amd and intel, amd have a much bigger problem. Intel admits having problems is completely irrelevant cause they are not talking about "safe" settings like puget is using, are they?
Of course it matters a ton, and a crap load of importance if it is degradation.
For normal chip lottery, certain % will be defective and passed initial screening without stress testing, for any consumer, SI or DIYers, getting a defective chip which will crash in a quick stress test is the best way of defective chip.
As a normal and sane hobbist, you put in your chip and ram and maybe GPU, connect the power, install basic windows and stress test the CPU for 15-30min before even doing all those putting in case and cable management, you immediate noticed the issue, stop the complex installation of everything else and not putting your work in it, then go back to the shop for the 7 days return period for a new one, slap it in, run the test fine and you are good to go for years.
For degradation, you do all the carefull tuning, runs stress test to ensure it runs stable, go on to work with it, and it bite your butt within months and crash your work and games randomly, so you need to try identify which thing is wrong, dismental everything and with the immediate 1 for 1 exchange period expired, you are forced with a chipless PC decloration and works stuck before the RMA ever come back, which degrades slowly again and repeat the process. Everyone self use or selling the PC will want a dead in factory chip so they can screen out, swarp it and then go on, no future trouble taken.
and as I said, don't look at stupid % only, the 14th gen is failing more than 11th gen they sold already, yet the % is low, it just means the base number of RPL sold is higher, and random failure gets diluted. Yet for normal working PC, if it isn't crashing to a point of completely unusable, like it just crash once a few days a time, most of the users won't even file for a return for repair, It just clear up some settings and ask you to just use it until it BSOD left and right before they will contact the SI, so any fail at shop rate is a big issue, much bigger than fail in shop