[k__]

By not caring about IE11?

You simply have to ask yourself, who do you want to sell your stuff to.

If you got a rather technical audience for example, chances are hight that most of them are using current browsers. So you simply develop for them and get a very simple build process, which eliminates many potential bug sources.

If you want to sell to Siemens, Bosch, Daimler. Chances are hight that they use IE11.

You can also start building for current browsers and if too many people complain or you get the feeling that you lose too much users by ignoring IE, you simply add Babel or something.