If you’re looking for retro style graphics then you would be looking for the best performance possible, like Minecraft, BSP is not efficient for a game engine, never mind the process in making it, it actually makes the game run slower.
And for people that struggle with making good graphics then doing it with BSP isn’t going to help them at all. The only advantage is that it’s in the program, if you want something easier to use then use a 3D program. You can even learn how to do BSP style modeling pretty quickly there.