For most techno and tech house I doubt mixed-in-key is of much use. The music is very much abstract so nearly anything works with anything. Maybe some Detroit melodic techno or tech house bordering on deep house would be exceptions.
Electro house has more melodies and song structure so that's where key clashes could be heard.
Mixed-in-Key is nice but for most it is best to just learn to hear directly what sounds good and what not. One less dependency to worry about with unknown setups and music collections.
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