I found it quite ironic that the site with an article on making your url 'prettier' had this for theirs:

"https://eternitywebdev.com/removing-.html-extension-from-your-url-benefit-for-seo-yeskind-of.html"

Remember that bit about making it easier for viewers, especially the not so technically inclined, to remember the url?

Made me smile. I'm leaving mine just as they are.