The problem
A backlog grooming session on a whiteboard is fast and productive. You write story titles on index cards or sticky notes, stick them on the board, and physically move them up and down until the priority order feels right. The whole team can see the full backlog at once. Arguments about priority get resolved visually.
The problem is the transition from board to tracker. Someone has to take the physical priority order and re-enter it into Jira or Linear in sequence. If there are forty items on the board, that's forty copy-paste operations, each requiring a trip back to squint at the handwriting. Story points written in corners of stickies get missed. Acceptance criteria that were brainstormed on the board in bullet form never make it into the ticket description.
Worse, the team often splits up before the cleanup is done. The groomed board exists in one person's photo library, and the tracker reflects last week's order until that one person has time to reconcile it — which might be never.