Anyone else notice spark plug quality/life going downhill?

Or bad AFRs
My Copper Champions have been in there since 1999 and have over 100,000 miles on them.Hyup 5 zeros. I bought a new set in 2004, thinking it might be about time. But after the car went 93 in the 1/8th on the 5 year/50,000 miles old plugs, I just put them in the trunk.
FWIW, I run the old Accel square-top big Yellow Super Coil; I think I could make a welder with that coil.My engine don need no steekeen' multi-strike CDI.

But yes, in the powersports world, we even noticed something going on in the NGK line. I won't say the quality went down exactly, but we definitely had more issues after about maybe 2008ish. Random quitters, just as you experienced. On a 1-cylinder that sucks, and the customers were quick to point that out.