Seriously. Do not use.

If you start to use flexbox, then you won't be able to get rid of flexbox model. And your content will rule of your layout. You will get strange bugs with overflow, growing, shrinking, etc. flex-grow and flex-shringwill be your friends forever. And each of your component will affect on his children without your participation.

So, don't do that. Listen Jake if you don't believe me.