I find the "Do not block the event loop" example terrible:

  const fs = require('fs');
  fs.readFile('/file.txt', (err, data) => {
    // perform actions on file content
    fs.unlink('/file.txt', (err) => {
      if (err) throw err;
    });
  });

This comes right after a section about "use flat promise chains" and is also vulnerable to leaving file.txt behind if the "perform actions" part throws. Much better example imho:

  const fs = require('fs/promises');
  const data = await fs.readFile('/file.txt');
  try {
    // Do something with the data
  } finally {
    await fs.unlink('/file.txt');
  }