MediaWiki's default for generating "Other resolutions" options for PNG previews for SVG files seems to be based on the same logic as for other file formats (offer small- and medium-resolution versions smaller than the full resolution), when they can actually be rendered as PNG previews with resolutions much larger than the original SVG file's resolution. de.wp, en.wp, and Commons already have JS that under the mostly useless"Other resolutions" line generates a line that says "This image rendered as PNG in other sizes: 200px, 500px, 1000px, 2000px." See https://en.wikipedia.org/wiki/MediaWiki_talk:Common.js/Archive_17#SVG_files:_links_to_rendered_PNG_images
However, since these larger sizes are not offered by default by MediaWiki, it creates a confusing situation where some projects then have redundant lists of options offering previews of different resolutions, and all other MediaWiki projects are stuck with non-ideal "Other resolutions" options.
Compare https://commons.wikimedia.org/wiki/File:Meuble_h%C3%A9raldique_Crosse.svg (redundancy) and https://en.wiktionary.org/wiki/File:Meuble_h%C3%A9raldique_Crosse.svg (non-ideal options)
This is particularly problematic when the original SVG (as many are) has a resolution too small for MediaWiki to generate "Other resolutions" options, and then the user gets no PNG preview options at all.
Ideally, SVG images should give PNG preview options like "200px, 500px, 1000px, 2000px" by default, even for very small SVG originals.