Agreed, a boundary is a boundary. Here in CA the board has stated that if you show a boundary line on any map, that IS a boundary survey subject to state laws. In other words, even a simple lot topo might trigger the need to file a record of survey. It makes sense to me, the board is trying to reduce the number of half-assed surveys floating around and causing problems.
One way around a record of survey might be to call it a construction survey and set offsets to the fence. On the map don't show the boundary line, only the points staked and proposed fence. Of course you still need to resolve the boundary, and you're still fully liable in case of an error.