Question: Is it possible to uglify all the RequireJS modules without concatenating them into a single file? (I know the other way round is possible with `optimize: "none"`).

Answer: 
Material UI have implemented their own Flexbox layout via the [Grid component](https://material-ui.com/components/grid/). 

It appears they [initially wanted](https://github.com/callemall/material-ui/issues/3614#issuecomment-193119929) to keep themselves as purely a 'components' library. But one of the core developers [decided it was too important not to have their own](https://github.com/callemall/material-ui/issues/3614#issuecomment-250996378). It has now been [merged into the core code](https://github.com/callemall/material-ui/pull/5808) and was [released with v1.0.0](https://github.com/mui-org/material-ui/releases/tag/v1.0.0).

You can install it via:

```
npm install @material-ui/core

```

It is now in the official [documentation with code examples](https://material-ui.com/components/grid/).
From the description of [material design specs](https://www.google.com/design/spec/components/grid-lists.html#):

> 
> Grid Lists are an alternative to standard list views. Grid lists are
>  distinct from grids used for layouts and other visual presentations.
> 
> 
> 

If you are looking for a much lightweight Grid component library, I'm using [React-Flexbox-Grid](http://roylee0704.github.io/react-flexbox-grid/), the implementation of `flexboxgrid.css` in React.

On top of that, [React-Flexbox-Grid](http://roylee0704.github.io/react-flexbox-grid/) played nicely with both [material-ui](https://github.com/callemall/material-ui), and [react-toolbox](https://github.com/react-toolbox/react-toolbox) (the alternative material design implementation).