@nikodemus
Well, parentheses are fine for (some) side effects of (more complex) arguments, but¹ also can derail from the (main) argument. So I now² often use footnotes as an additional tool.³ But nested parentheses⁵ are fine too.

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¹this is not meant as an argument against using them
²on toots
³they not only allow to talk about separate aspects,⁴ they also can have their own (useful) parentheses.
⁴without breaking the main stream of thought
⁵we should use all the ❨❪⦅…⦆❫❩ ;-)