This was added last week:
Can someone explain the purpose? In principle, I understand what the file is used for, as explained in the documentation. But I don’t quite understand the point that this is now part of the template for all themes and theme components.
Thanks for the heads-up - we shouldn’t have merged that into the default skeleton. Will get it reverted 
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Just a heads-up, a compatibility entry has been added again:
In hindsight, it makes sense to have that file present, with likely the oldest supported version or a comment somewhere that leads to the documentation for compatibility file.
it is a skeleton and compatibility file plays an important role these days.