statamic + mixture example settings

{
    "debug": false,
    "lintScripts": false,
    "preprocessorLocations": "/_themes/denali/css/",
    "preprocessorScriptOutput": null,
    "preprocessorStyleOutput": null,
    "projectName": "statamic 1.6.4",
    "projectDescription": "statamic original",
    "publishedId": null,
    "serverHostname": null,
    "serverPort": null,
    "templateDirectory": "templates",
    "templateDefaultLayout": "layout",
    "templateDefaultPage": "index",
    "type": "simple",
    "useCompass": false,
    "simpleModePartnerServer": "http://localhost/statamic-1.6.4/",
    "simpleModeFileTypes": "md,css,js,html",
    "modelSource": null,
    "domain": null,
    "convertHtmlOutput": null,
    "followLeader": false,
    "routes": null,
    "customRubyPath": null,
    "remoteDebugPort": null,
    "sass": null,
    "optimiseSVG": true,
    "optimiseImages": true,
    "password": null,
    "ignoreDir": "ignore",
    "customTodos": null,
    "ftpSettings": null,
    "autoPrefixer": null
}

As a matter of interest what is the difference between including the mixture settings file in the Statamic root dir instead of the theme dir?