I think Hybe groups weren't invited just because they are Hybe. But for the rest I think it was a message that these are currently the top 4th gen groups. Especially for th JYP ggs. We officially have the industry's TOP5 which are Gidle, Ive, Aespa, NJ and LSFM. And I can't disagree with it, just fact.
Also the MAMA best gg nomination
The fact that MNET of all didn't try to sneak in Kep1er in there speaks volumes.