Set control to combo when creating domain elements

When creating a new column with domain elements you have to set the control to a type that can work with domain elements (like combo). 
If the control is not combo lookups using this domain won’t work properly in universal. 
However, why would you want to use domain elements without combo (or the other options like radio button and checkbox)? I would argue combo is the most used option. There is a validation for this, but I would opt to setting the value to combo by default, and the user can always deviate from this. 

To make the SF user friendlier and less complex. When you add a domain element and the control is empty set the control to combo instead.