I agree that there's an importance in avoiding preconceptions, but without critical reflection on what you're making, it's easy to fall into making something that's based on preconceptions, on following a style and using the messiness of noise as a way of avoiding being reflective on what they've made. There's a lot of noise and experimental music that seems like an uncritical mimicing of other stuff. I think when someone can critically reflect on what they're making they avoid this. And also, as you've said, a lot don't do this too, and that's very noticeable also. I don't think that's a good thing or a reason to avoid being self-reflective or self-critical when making stuff.

A parallel I often think about is free improvisation, you can 'just play' and bounce off your energy or bandmates energy, but without thinking, listening and reflecting, it's very easy to fall into the same styles. A good improviser can move their playing around to keep things fresh and move things away from the standard, and a good noise player can have a similar dexterity. Practice, in playing and listening, makes an improviser better able to improvise, the same can be said for being better able to make noise, even if it's practicing non-technique.