Question about installation instructions

The readme only gives these installation instructions:

```
curl https://drupalconsole.com/installer -L -o drupal.phar
mv drupal.phar /usr/local/bin/drupal
chmod +x /usr/local/bin/drupal
```

Why doesn't it mention the following?

```composer global require drupal/console-launcher```

This is much more "composer-style" and it also works much easier for Windows installation.