If you're willing for your video to suffer quality from bad compression settings because your browser is a "dumb" tool that just applies some preconfigured compression scheme, then great. Also, how many people are going to accept that instead of just uploading files and seeing immediate progress vs waiting for a browser to compress a file from some sub-$500 laptop? What codec is it encoding to? H.265? good luck getting that to complete this week on that cheap laptop.