Fwiw I work at a company where engineers use AI heavily to produce the majority of work outputs but we also have a Slack that's just as lively as ever and plenty of evidence of humanity. Your experience sounds bad and you may be able to find a better one! It's not all bad everywhere.
How established is your team? I can see how teams that existed from the pre-LLM era can maintain their vitality, but would expect newer teams to struggle a lot more. Also, remote or in-person?