I took a look a the JS file that was throwing the issue on IE11. From what I can see this file is for the event listeners for views frontend actions.
I believe it's just a compatibility issue where IE 11 doesn't support the methods being used. Which is expected as IE11 is approaching its end of life cycle and will no longer be supported by modern programming conventions.
However based on the nature of the error I don't believe there will be any functional degradation in ie 11