Every object, no special build

Bulk update is a platform primitive available on any record type, and it picks its execution strategy by volume, so ten rows and ten thousand each get the right plan.

All or nothing on permissions

The batch is authorised as a whole. If the actor can't edit even one record in it, the whole batch refuses and says so. It never silently shrinks to the rows it could touch.

The rules still run

Record-level business rules see every row in the batch, so bulk isn't a side door around validation. A sweep obeys the same logic a one-at-a-time edit would.

A book move that's accountable

Reassigning a book of business runs as one transaction that completes entirely or rolls back entirely, and every record keeps its own before-and-after history with the acting admin attached.