Client and server folder in Meteor 1.3

With the introduction of ES2015 modules, developers are encouraged to put the main part of their code inside an import folder, right? You can then directly influence the concrete loading order to make sure you don’t load more than you have to, speeding up your app.

The official Meteor guide proposes to divide the import into main areas: api, startup and ui. My question is, what should then come into the client and server directories, except client.js and server.js, the entry points. For me, it would be unreasonable to praise a new application structure in which you put everything inside one folder.