Esync was the other one. Basically either of those enabled (honestly probably both were) and it didn't hit a corner case with issues, NTSYNC is basically no benefit. (I personally would rather use NTSYNC)
Gentoo also has a tracker [1] for GCC 15 issues that they've been working on as well. (Note: GCC 15 is masked in Gentoo so you have to go out of your way to install it)
Intel has always had randomly supported ECC on desktop CPUs. Sometimes it was just a few low end SKUs, sometimes higher end SKUs. 14th gen it appears i9s and i7s do, didn't check i5s, but i3s did not.
All of these sort of things are just based on hours used. It's like looking at your hot water heater warranty and replacing it when it's over (I live an an area where the PPM of the water is rather high and hot water heater warranties are basically calibrated for water like mine, so we do have to replace them on warranty expiration, most places you at least get a few years or double)
You can also put the 72 pin connector in boiling water for like 30 mins, take it out and let it cool. That should reset the pins back to "factory condition"