I've heard a number of terms from current and past jobs in corporate America that might be considered.
Useless conversation that's not solving the issue at hand because it's left the world of the strategic and become too detailed or academic may be said to be:
"going down a rat hole"
"getting in the weeds"
Correction is often initiated with phrases like:
"I think we're getting wrapped around the axle."
"Let's bring this back up to a 30,000 foot view of the problem."
"Let's keep separate issues separate."
"Our time is limited, I think we're going down a rat hole rather than focusing on the original topic."
"These are useful points to consider: let's put them in the parking lot and come back to them in a different session."
"I think we're trying to boil the ocean here."
Worst of all is a response someone may offer to someone explaining at length (or in a challenging tone of voice) a detailed part of the problem that is well-understood by almost everyone in the room. The disrespectful response to this understandably irritating situation is often simply: "Peace."
It's intent is supposed to be "I hear and understand the valid point you're making" or "you're preaching to the choir," but it's meaning in the moment often more directly resembles the speaker saying "shut up, I'm tired of hearing your gums flap."