I’d highly recommend incorporating them. I liked them when I played with them. Out of the book if 2 players do not agree on a realm it’s a roll off and then pick (50% chance to dictate realm), which I do not like (wish it just said if no agreement then randomize or no realm is used) but that’s an easy FAQ fix.
If they turn out to be awful I’m hopeful gw will fix it.
If they are awful and gw drops the ball then we as players can follow the standard set by B&G, Blackout, Facehammer, and Heat 1. 6nations as already released its pack and realm rules are not in play.
IMO the worst thing that could happen is having countless packs that are all drastically different in what the standard is.