WaPo says this can be a 6 figure difference in compensation but frankly why should a future employer get to know how much I make? Maybe I’m a level 3 but deserved to be a level 4. Maybe I’m a level 5 but actually a level 2 that’s just really good at office politics.
If I want my employer to know what number Apple assigned me, I’ll tell them.
EDIT: Telling companies a Level 5 engineer was an associate if associate isn't a superset of Level 5's is shady, and I can't defend Apple on that point. From what I read of the article that wasn't clear to me. They do say the title is generally linked to more junior roles but that's relative and you can still be old, experienced and well-paid but if you're not a manager I might consider that an associate.