In reply to Thomas Higginbotham.

WebP user experience is still very poor. You can’t right click and download the image, the social networks (Facebook, Linkedin) don’t support it so you need to create the JPG anyways. E-mail clients don’t support it. There’s a TON of plugins that already provide this as feature and that’s where it should stay. If you want this functionality, it’s easy to seek out. Ultimately, this doesn’t belong in core. The idea that WP’s competitors are doing it and that’s why WP needs to do it is not a persuasive argument to me. They are a tiny tiny sliver compared the behemoth that WordPress is, and it’s because WordPress has emphasized for so long ease of use, management, and backwards compatability. WebP violates all of those tenets, and should be left to the realm of plugins.