This lowbrow criticism is really old. Google doesn’t do much offline for the same reason almost no one does offline anymore; it’s hard and the number of users affected is very small.
Do you honestly think Google is looking at the number of maps users that go offline and saying, “We absolutely need their data!” rather than “Eh, not worth rearchitecting everything for.”
Not to mention they have done a lot for it even if it’s not perfect. There’s a dedicated team doing their best with it. It’s just not worth giving a lot of attention and resources.