By patching Rock Grass Remover to also remove the rocks from Cathedral Rocky Shores, it effectively removes 3D rock grass, and removes grass from rivers and river shores, with basically any grass mod setup. This should also remove the ugly grasses you can see underwater from shore lines.

Cathedral Rocky Shores is good at preventing grass from clipping through a lot of waterside objects and from keeping a full lawn out of the water, but it has its own problems and sometimes, rarely it can also clip. It also costs a few precious FPS in some areas.

3D rock grass is also generally undesirable in more advanced mod setups, and can end up mismatched or just looking completely out of place when Complex Grass is enabled in ENB, an ENB lights it incorrectly compared to the environment, or when utilizing parallax/ complex parallax terrain textures.

All of my screenshots were also taken with Landscape Fixes For Grass Mods enabled, along with the optional zNo Riverbededge Grass Coast or the Rift patch.