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With brush based level design you don’t need to know any modeling.
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If that is your opinion, then I wouldnt call it “modeling”.
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to make detailed walls and etc would take way much more time in brush editors than in an 3D program
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Indeed. And you are stuck with the default unwrapping for textures.
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Texturing is blazing fast as you don’t need any unwrapping/baking/painting to do
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And thats where the performance goes out of the window.
Im currently making a turorial on how to do fast level prototyping without brushes.
Ill post the link when its online 