Jan 14 2019
@Jdlrobson Thank you for your feedback. A method of making editors able to set the page image was briefly mentioned in our previous discussions on Wikivoyage. On the long term, that would be a good resolution to this issue. For now though, we may have to resort to $wgPageImagesLeadSectionOnly. I've previously suggested this as well, the only problem being that Wikivoyage tends to have its images appear in the second section of the article, rather than the lead. Naturally, this can be solved without too much trouble through the means of a bot.
Jan 13 2019
Allow me to chime in and add some more information here:
PagePreviews, which uses PageImages, was introduced to all language versions of Wikivoyage about a year ago if I am not mistaken. We since have found that these previews present readers with images that are not helpful to them. These would be images of things like train stations, tourist information centres, airports or non-representative landmarks, rather than an image that does represent the destination. A small list of such pages with undesirable preview images I have made accessible here. To see the images, hover your mouse over the links in the article. In brackets behind the link you will find where this image is specified within the article if it has been found. This should be enough information to then find this image in the linked article's source code.