Why wouldn’t at least an engine monoculture help with incompatibilities and ease the development of sites? If all the browser makers agreed on a standard then w

Why wouldn’t at least an engine monoculture help with incompatibilities and ease the development of sites? If all the browser makers agreed on a standard then websites wouldn’t have to show “your browser is not supported”. Saving sons and daughters across the world from many tech support calls from their parents, and aiding all the IT techs from having to keep different browser defaults depending on what team they are working with