As far as I know, open file formats have become the standard for basically all industries and types of files. However, some of them, like the Microsoft Office Formats, are still proprietary. I have seen Open Office documents and Ogg being recommended for Office documents and audio files, respectively, but I’m somewhat confused about other types of formats like video.
AV1 is already almost like that though.
You’re right, but that universal hardware support is still lacking. It’s spotty on different tv boxes, phones, consoles. It’ll get there!