(VIDEO) UE4's Geometry Mode is inadequate when compared with that of Quake 1

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Also, another problem is dealing with detailed enviroment, to make detailed walls and etc would take way much more time in brush editors than in an 3D program, that’s why I think gave up on them and decided to use only for prototyping levels.
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If you are skilled 3D artist, sure, it might not take whole a lot of time to model nice detailed mesh. However, taking into account sculpting/baking/texturing, it will take more time to get level done (from idea to final implementation) and requires specific highly developed skill.

With brush based level design you don’t need to know any modeling. Texturing is blazing fast as you don’t need any unwrapping/baking/painting to do. You can utilize tiling textures is many ways and reuse them on the go, while with 3D models you have to back to 3D app and re-UV map you mesh.

Brush based level design doesn’t work for all games of course, but it works for many many games, especially for indies as they don’t have whole a lot of resources and time to go after highly detailed meshes.