Being able to hide/show fields in the form view based on the values of fields higher up in the form could be extremely valuable.
For instance, if using Airtable to keep track of leads, one might have a Single Select field with the following options:
Met at a conference
Contacted through website
If “Met at a conference” is selected, it would be valuable to collect information about that conference in a conference field, but it wouldn’t make sense to capture that info for any of the other options in the relationship field.