Clearances haven’t changed in decades and looking at the oil spec of our same engines in other countries pretty much gives that argument up anyway. But yes, people still try.
Regardless, GM and all other automakers always knew the real risk is not with viscosity too high, but too low. They still played the game and finally have to admit defeat on this round.
Unfortunately they gave the DEXOS license to the M1 AFE 0w30, and not the much stouter ESP version which has a 3.5 HTHS. But hey, if a guy wanted to ignore DEXOS but still stay relatively “warranty safe” the ESP 0w30 is still API and seems to be a decent option. Certainly puts owners in a better spot than in the previous gen trucks where nothing API 0w20 would ever actually work.