There's a lot of shapes, details, and textures that you wouldn't normally be able to do with modter, especially since you'd have to abide by the grid, so you'd have to make some adjustments here and there
Speaking as someone who recreated a map in a 3D modelling program, and then recreated that using modter and various other bricks, i still much prefer the map version, it looks cleaner, and nicer
I hate how static maps take up dozens and dozens of datablocks and adds a lot of DTS files to download, but i'm not gonna stop someone from doing what they want and how they want to