Exercise 2: Why Internal Linking and Sitemaps Solve Different Parts of the Same Problem — Possible Solution
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WHAT INTERNAL LINKING ACTUALLY PROVIDES
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Per this chapter, "every internal link is a small vote of relevance
from one page to another — search engines use this internal linking
pattern to judge which pages a site itself treats as important."
Internal linking's own real contribution is twofold: it's a discovery
path (a crawler following links can reach the page) and, separately,
a relevance/importance signal (how many and which pages link to it
shapes how the site itself appears to treat that page's importance).

WHAT A SITEMAP ACTUALLY PROVIDES, PER seo1-5
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Per seo1-5, a sitemap is "a direct, machine-readable inventory of
every URL that exists, submitted straight to a search engine,
regardless of how well internal linking happens to be structured" —
specifically built to rescue pages with no inbound links at all,
where link-following could never have discovered them regardless of
how the rest of the site's own linking is organized.

WHY THESE AREN'T REDUNDANT WITH EACH OTHER
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A sitemap can guarantee a page gets discovered at all, but per this
chapter's own warn-box, "a page that's never linked to from anywhere
else on the same site gets no internal link equity at all, regardless
of how good its own content is." Being listed in a sitemap doesn't
generate the relevance/importance signal internal links provide — a
sitemap only solves the discovery half of the problem, not the
signal-of-importance half.

WHY BOTH ARE THEREFORE NEEDED FOR DIFFERENT REASONS
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A page could be present in a sitemap (solving discovery) while still
having zero internal links pointing to it (missing the relevance
signal internal linking provides) — and conversely, a page with rich
internal linking but somehow missing from a sitemap still relies on
those internal links as its only discovery path. Per this chapter,
these are "genuinely different parts of the same underlying problem" —
getting a page both found and recognized as important — because
neither mechanism alone accomplishes both halves.

WHY THIS WORKS AS AN ANSWER
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It separates what internal linking specifically contributes (discovery
plus a relevance signal) from what a sitemap specifically contributes
(guaranteed discovery only), using both this chapter's own material and
seo1-5's, and explains why a page can be well-served by one mechanism
while still lacking what the other provides.