Exercise 1: Why raw_id_fields Still Isn't Enough — Possible Solution
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WHAT raw_id_fields ACTUALLY FIXES
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Per this chapter, raw_id_fields replaces the default admin's giant, flat, alphabetically-sorted dropdown of every single Page with a search popup instead - a real, worthwhile improvement that costs almost no code, since typing a search term is much faster than scrolling through hundreds of unsorted options.

WHY IT'S STILL NOT SUFFICIENT
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Per this chapter, a search popup is still fundamentally a flat SEARCH, not a browsable TREE. It still gives no indentation, no visual sense of depth, and no natural way to browse "show me this page's children" or understand where a given page actually sits in the overall hierarchy - exactly the same structural gap the plain dropdown had, just easier to search through. Genuinely managing or reasoning about the tree's own shape - which pages are siblings, which are ancestors, how deep something sits - requires actually seeing the hierarchy, not just being able to search a flat list of full_path strings, however quickly.

WHY THIS WORKS AS AN ANSWER
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It correctly explains what raw_id_fields does improve (search instead of scrolling a flat dropdown), and correctly explains why that improvement doesn't solve the underlying problem - it's still a flat search mechanism, not a genuine hierarchical browsing interface.