I,.for one, can clearly tell between 2 different oils in my engine(s). And no, it's not old vs new oil. I know for sure how PUP felt and sounded in my engine when oil was new VS the new M1 I have just poured.
I pay a lot of attention to how the engine (and car for that matter) behave. If you can't then a. You don't care b. Your senses are worn c. You just want to negatively disagree and make a useless fruitless discussion.
My 2 cent. For OP i wouldn't just rely on WM or I would never change oil lol. My local WM sucks or manager sells to shops I don't know. I order through Amazon what I want.
My current gold standard is M1 5w30 EP HM.