Most of xml files of modules contain this line.
So we must take a decision - if this line should be present, then it must be present in all modules.
If this line is unnecessary, then we must remove it from all modules.
It is not required to list the XML as part of the manifest; it is always copied over. As long as its consistent, the manifests can be updated either way to include or exclude the XML file.
So what is your suggestion?
Right now it's not consistent - some module xmls have this line some don't. It's confusing for anyone who studies core Joomla modules as a base for his own module.
I'm not sure. As far i know we don't need to add this via xml as we do it automatic?