New Lines in XML-Files

[astridx]

When should a new line be inserted in XML files?
In the https://github.com/joomla/joomla-cms/blob/9efee5154ca98fe1429cdfa09c1088fef47a4cfd/administrator/components/com_config/forms/application.xml#L268, the lines 274 and 278 are too many. Right?

I mean that a fieldset should not be separated with a new line either. So the line 270 is too much, too. Is that correct?