Wikivoyage's use of RelatedArticles predates the reboot done by the reading web team. They have been using the extension to manually curate lists of related articles on a variety of pages. For instance on the page Japan:
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For the community to continue to adopt the new version of the extension which shows cards in the footer... and allow us to remove the legacy sidebar code... on Wikivoyage it should be possible to have more than 3 related pages using the RelatedArticles extension so that it doesn't hide content they've already provided.
On https://en.m.wikivoyage.org/wiki/Japan for example there are 5 related pages. All 5 should be shown.
= Appearance
3
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4
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5
You get the idea
= Acceptance criteria
[] The RelatedArticles extension has a configurable limit which defaults to unlimited
[] The limit is disabled on Wikivoyage projects
[] The limit is 3 on all other projects