Three good points in favor of this method.
1. It allows old mods to benefit from the added entities without need to update the mods.
2. It doesn't interfere with the old ent file system.
3. It allows multiple overrides to the same map.
Another fine product from the R1ch-forge.
While we are on the topic of ent files, does anyone have a resource for sharing ent file collections? I have thousands of maps, but only a small number of ent files by comparison.