You need that for child themes. If you have a separate header.php a child theme can use its own header.php and override the parent theme’s file. Plus, header.php and footer.php are used in wp-signup.php.
Another reason is readability: Putting all the code for a theme into just one file gets very messy very fast.
A use case for a compact theme is testing and debugging: My Mini Theme uses just index.php and comments.php for output. Whenever a plugin doesn’t do what I expected I use that theme to be sure it is not a theme issue.
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