In my writing, I sometimes deal with complex concepts, some of which - if they are to be properly expressed (by which I mean precisely expressed) to a reader new to the concept - are dealt with in a sentence which consists of three layers; as is this one. Here, the brackets are the inner layer, dashes the intermediary, and the outer is the sentence itself.
Sometimes I have found it convenient to further complicate matters by conveying two concepts - already embedded in the intermediary layer; necessary because of depth of argument - which are divided by a semicolon, within dashes.
For the first time in my life, I saw - yesterday (in ELL) whilst browsing - someone use double brackets. They expressed a thought (and then another thought ((interrupted by another thought)) which was bracketed) which was well worth reading about.
I don't find any of this at all difficult to digest, myself.
But my question is, does any of it conform to normal expectations of punctuation ?