If something else came up is not allowed it means you need a perfect plan that survives contact with reality. This is possible for short tasks perhaps but not an entire team for 90 days.
If they have completely ignored company priorities that is bad but often it is some technical glitch has come up that moving a box 1px to the left really wasn’t as easy as first thought.
Yeah, "company priorities" is the level I like longer horizon planning to be at. "It's important that we achieve X, Y, and Z in the next quarter", with well thought out priorities and clear communication, then let teams figure out how to deliver.
If they have completely ignored company priorities that is bad but often it is some technical glitch has come up that moving a box 1px to the left really wasn’t as easy as first thought.