Related to this, the functionality of conditional formatting within a fieldset is also janky. Creating visiblity rules for a fieldset based upon condition of field within fieldset does not work well. For instance, having a fieldset (that includes country, state and zip) show up only if one of those fields is empty doesn't work if any of those fields are conditional, since conditional fields do not prepopulate, hence the form always appears.
Furthermore, if conditions for a conditional fieldset are met....it immediately disappears, which is an odd experience for the user. What if some information was entered wrong, it disappears and the user can't correct it. For example a fieldset that includes country, state and zip and which is to be visibile if any of those fields are empty will immediately disappear once the fields are filled. It would be better for it to wait until the submit button is clicked before disappearing.