Found conflict between what-input.js and Drupal's AJAX form system

[wheelercreek]

I've found that the what-input.js file that is bundled with Foundation 6 was causing my Drupal Ajax form to stop functioning. Still not entirely sure why, but removing that javascript file from our Drupal theme resolved the issue. You can see a more complete account of my problem here:
https://drupal.stackexchange.com/questions/313402/trying-to-populate-one-form-select-with-another-using-ajax-getting-ajax-form-a

My question is, Foundation still seems to be working fine after having removed what-input.js.. I'm sure it was needed for something? Is there something I should expect to break now?

Thanks