The customize form behavior is a great tool. I think it lacks to include in the customization to be able to show or hide text and section elements from the form.
In some forms I have 4 columns in a section that depending the value of certaing field wont show at all, but the section still appears, but empty.
Being able to show or hide text sections depending the value of other fields would help a lot in giving instructions to the user on how to fill information.