i've never seen one genre have so many definitions.
i can understand how people can relate their own understanding of music to a specific style they may currently be into. and a lot of genres do touch borders but for my understanding hi-nrg and techno are realy worlds apart. ok they both are electronic and have a 4x4 dance beat with pace but the similarity ends there.
there stills seems to be this wider perception that anything electronic that is not house or d&b falls under the techno umbrella. i could go into great detail and argue to some till im blue in the face but always someone will come along and say something like 'acid trance is techno', so yeah, realy, what is the point, it does come down to a peronal understanding.
at the end of the day we can only believe in what we are limited to understand.
there is a tone of information out there that documents the birth and progress of techno, detroit techno etc. ill post some links if anyone is interested.