Other, more striking callback issues are not mentioned

Using callbacks comes with many issues and indentation with curly braces jungle is but one of them. By passing a callback you are passing the control over to a potentially buggy code with undesired behaviour.
The callback problems are:

• callback can be called once, twice, infinitely many times, or never, and you have no control over it
• callback can be called in synchronous or asynchronous fashion
• callbacks swallow exceptions and force developers to conventions
• callbacks make writing the curlybraced and indented code easy

I did not invent all of it myself, I learned a lot in YDKJS: https://github.com/getify/You-Dont-Know-JS/blob/master/async%20&%20performance/ch2.md

Yet the webpage only mentions the last one, from my point the least important one. Is it possible to at least mention that there are other, more serious problems, which actually turn this whole area into a real hell?

Überprüfe die bestehenden Webseiteninhalte des Repositorys und den in issue #26 besprochenen callback-Abschnitt. Füge eine kurze Abdeckung der aufgeführten Probleme bei der Callback-Steuerung, der Zeitsteuerung, bei Ausnahmen und Konventionen hinzu und verifiziere anschließend, dass die Seite die weitergehenden Anliegen über die Einrückung hinaus widerspiegelt.