It depends on how intertwined the EU is to that particular piece of media. If it's something that can really stand on its own and be great without knowledge of other aspects from other media, I'd say it's a really poor excuse. But if the media relies on a knowledge of other media to enjoy it, it's more passable. Like if something happened in John Wick that was explained away in John Wick Hex, that would feel odd. But if it were something in the MCU where you're kind of expected to have seen a good amount of these films already, that seems fine to me. The Palpatine Fortnite event is probably the weirdest instance because I'm not sure how much I'd consider it "expanded universe content", especially when it was such a limited thing, in a property with no other solid ties to the franchise, and can't currently be experienced again.
Edit: Changed the John Wick thing a bit so it's not just a sequel.