I'm a bit confused here.

On one hand you say it's two lines of code. On other hand you suggest that each service provider will implement it's own functions.

What's the harm from adding - small , unbreakable functionality? 

Your points for small code could have also been raised against implementing reverse() - yet Python still implemented it - saved the 2 line code from the developer.

At the end.. small change or not.. This is a new format.
Conversion between formats are required from any programming language..