Code written using experimental features will always require transpiling, which represents an unnecessary performance cost. Never use or transform experimental features in production code. Like, ever. It carries zero user-facing benefits. This is an easy thing to avoid for Babel in particular: step lightly and do your research before using plugins or presets to transform production code if their names contain the word “stage” or “proposal” (http://bkaprt.com/rjs39/05-14).