Legacy Reading Experience
All parenthesis pairs are opened by default. There is no way to close them.
Text is overloaded by information. Unnecessary information in parentheses makes it hard to read, stay focused and actually understand the text (for real).
To get back in control, to decide what to read and what not (let’s skip the useless parts), we need to fade out the parentheses.
Parentheses folding (or parentheses collapsing) is a new technique to do this.
It enables you to read only the important stuff: Read less, understand more.