Here is a screenshot of a module that is in development:
The deep nesting is a bit extreme and I don't think it is needed, specifically in regards to the name="children" elements. Is there any way to consolidate these by attribute rather than element, so setting something like is-child="true" accomplishes the same thing?
I haven't explored the Magento 2 XML layers significantly, however I'm assuming this appears in a few different other locations as well. Anything to assist us devs debugging this very deep nesting would be helpful.