Yeah, this is a wording tweak, rather than a flow change I think. We need to instill in people the permanence of the operation they are instigating, but still offer a safety net—the 5 second undo window—where we can, just in case of a button fumble etc.
It will cost a very small amount yes. But we are going to need to tune when and where these indicators/dialogs are shown, as it might get a little fatiguing if they are always interrupting the flow.
We have the componentry designed which is the important thing, and they can be deployed when we learn more about the cost, and user tolerance to levels of expense, closer to launch.
If you check out the feature status board, you’ll also see we have spending limits and thresholds (both global and on individual PUTs) planned to help in this regard, but they are not considered part of the Minimum Viable Experience (MVE).
For the most part, ‘moving’ data won’t really be moving anything, just putting an entry in an index, so the cost would be trivially small.