Epic's angle was to get discovery so they could embarrass the shit out of regulatory agencies and legislators by pointing out how they were sleeping on an obvious, decades old antitrust case. It worked. The DMA wouldn't have been a thing without Epic suing.
it sounds like the EU is going to slowly push on Apple t do the very thing Epic wants regardless. https://appleinsider.com/articles/23/11/08/apple-admits-thir...
So I guess Epic had the right idea but the wrong angle (or simply the wrong judges in the US. Probably a bit of both).