The idea is:
Allowing the dropdown form element in slack, and other form nodes to have a search bar.
When having many many many options, having a search is really nice, especially if a bunch of the elements start with the same thing, eg; something-thisChanges.
My use case:
Having a slack form to ask in which channel it should post a message, or lets say you want a country dropdown, the search makes it way faster.
I think it would be beneficial to add this because:
It solves the issue of too many dropdown elements being slow to navigate.