<p><code>Really the only plausible reason I can think of is to allow people to quickly check that the ID is correct by visiting the link?</code></p>
<p>Yes. <g-emoji class="g-emoji" alias="smile" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f604.png">😄</g-emoji></p>
<p><strong>Other points:</strong></p>
<ul>
<li>it help to keep OSM database "clean".</li>
<li>it limit it maintenance.</li>
<li>it help to learn easily how to use keys.</li>
</ul>
<p>OpenPlaques seem to be a good project that could interest history amateur all over the world.<br>
(PS: I'm not implicated in this project)</p>
<p>Wikimedia commons is a "major" project too (18 2830 tags. It pictures help OSM contributors and users. See <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="48912508" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/834" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/834/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/834">#834</a></p>

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