Whilst you may not yet be as comfortable with ES6 as you are with ES5, the changes shouldn't be too hard to grasp.
As a developer it's important to stay up-to-date. Sometimes this isn't possible due to slow to update libs or technical restrictions, but to solely write ES5 due to preference is avoiding a small amount of learning for convenience.
As a developer it's important to stay up-to-date. Sometimes this isn't possible due to slow to update libs or technical restrictions, but to solely write ES5 due to preference is avoiding a small amount of learning for convenience.