Most sites right now concatenate their _entire_ javascript blob rather than the "necessary" javascript blob for the current page. There are arguably other uses

Most sites right now concatenate their _entire_ javascript blob rather than the "necessary" javascript blob for the current page. There are arguably other uses for minification and compression, but not needing to concatenate is going to save a lot of bandwidth since developers no longer have to consider whether or not they need to build another concatenated blob for specific pages.