Idk I disagree - after all it's mostly in the rookie years companies don't want groups to mention each other since they're still competing for fans. I feel like 4th gen groups interact more than 3rd gen groups did when they were rookies. itzy and aespa are my ult groups right now and I love how they talk about each other on bubble/vlive, even released the selfies they took together.
A lot of male groups mention each other and hang out altogether aswell like txt, ateez, stray kids, enhypen etc