The Thin Air is very good regarding all Ireland coverage imo, as are the Litany of Failures compilation series, so I think this is something that’s getting a lot better. But yeah until relatively recently you had a lot of the Irish music press only picking up on one or two names from the north, then you’d have the likes of ATL and AU up here focusing primarily on the north to make up the difference (though I remember AU doing an Irish Albums of the Decade list 10 years ago that introduced me to a lot of good stuff).
I still have musician friends who are quite tuned into the NI music scene but know very few of the non big acts across the border, so there’s still some room for improved integration I guess.