Most frontends (I don’t know any, really) doesn’t allow you to set a default language for your post. For that reason, a lot of frontends allow you to post without any language selected, while defaulting to English. But that is not universally true. Photon recently started requiring language to be selected and started defaulting to Undetermined language. This now creates unnecessary friction when the community doesn’t have it as allowed language and requires the user to select allowed language for every single post.