When I honestly think of industrial I too think true industrial should be sampled sounds of machinery and things found in the environment. That seems to represent what it is, but it is (and should be) so much more than that. More like Einsturzende Neubauten's approach.
Although I think the true industrial approach is to not have a preset form of music in mind when you make it, kind of let yourself connect to whatever instrument or noise maker that is around you. Of course you could come up with something other than industrial music this way, but that I think is the inherent in the industrial, if I may be so philosophical.
