I haven’t paid much attention to Hugo’s Page Bundles since they were introduced, but I should have. Page Bundles let me put a blog post’s images and other assets in the same folder as the original Markdown file. This means the images for a post ride along right next to the post rather than way over there in the /static/img/2018 folder. Over the long term that should be handy.
Also, thanks to Kaushal Modi for pointing out that his ox-hugo package already supports Page Bundles.