That Disgraceful, Disreputable, (Wonderful) Form of Punctuation: The Parenthesis

> those with control of the materials [...] won't share the list with AI companies.

These are definitely claims I would make if I was an AI legal company that hadn't solved hallucinations.

Endnotes maximize disruption, the reader has to turn to the back of the book to find the end note, then return to what they were originally reading. These are best reserved for citations or similar items where the added information is irrelevant to normal reading. Endnotes can have their own endnotes.

Footnotes aren't quite as disruptive as endnotes, but they're close. Footnotes can themselves have footnotes.

Surrounding an interlocution with two copies of the same character, whether a comma or a dash, reduces clarity —or makes the work ugly— when there's more than one interlocution in a sentence.

Parentheses allow nesting, don't disrupt the flow of reading the way footnotes or endnotes do, and don't reduce clarity with multiple interlocutions. It's generally much better to not have multiple interlocutions, as they inherently make the work hard to read. It's especially difficult to read nested interlocutions. But sometimes nested interlocutions are used to good effect, such as Terry Pratchett's humor involving footnotes of footnotes. Parenthetical interlocutions to define the first use of an acronym or initialism are also a good exception to the rule of avoiding multiple interlocutions in a sentence.

This is why Tufte-style margin notes are so nice. It is effortless to scan them and choice to read or skip. I wish more blogging software included it as a sort of standard styling option.

Your second formulation doesn't work. Words in parentheses should be able to be omitted without loss of grammaticality.

Instead,

The small (business) owner

would be a better contrasting formulation to the first one.