What good managers do is bother to actually read the group chats and give a fuck about the details. Re-read what they don't understand until they do and only then reach out with a short and scheduled meeting and maybe just a few DMs. Then they get to work coordinating the effort for the next sprint and make sure everyone is on schedule. Far too many managers these days are just kicking back and checking boxes or dictating absurdly oversimplified plans from afar.
A good manager becomes a student and servant of their own team. Anyone who doesn't want to do this needs to find another place to work. Just because we work from home doesn't mean we don't work.
You're probably not wrong, but a 99% sensible plan can still be catastrophically bad. The complex knot of decisions to be made in the 1% may completely invalidate whatever the AI already told the higher-ups. This happens even now when humans painstakingly plan something out (usually because someone is abusing their "soft skills" to buy time or keep others from worrying).
I think humans are still miles ahead in being able to spot a lie that will derail a project. If you force people to work under an equally incompetent AI middle manager, prepare to see them quit in a mass exodus for somewhere that doesn't. Nobody (except naive college grads) is going to risk getting fired or having their career ruined by an over-glorified cost-cutting measure that prioritizes the convenience of the rest of the business over the quality of the work being done.