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I don’t know enough about integrating multiple invasive anti-cheats in a single game, but it’s quite likely they have some custom glue.
The more important part is testing. No one wants to enable something without testing and they don’t care to do any work.
This is a poor excuse, they actively don’t support Linux: rocket league had a Linux version, which was dropped and now Linux players can’t play it
Just as a heads up, while they did drop the Linux client, unless it’s been changed very recently you can just use the Windows version through Proton/WINE and play that way.
Which isn’t an excuse for what they’ve done, I only mention it in case you or someone else didn’t already know.
I highly doubt they’ll find any bugs even if they did test it. Even if there were bugs, most likely Valve + the community would be the one’s patching it.
Epic doesn’t want to try because they have a stick very deep up their ass.