Often, though, the only available approaches have an MDA that's still within
Class E. In that case, there's no problem seeing and avoiding VFR aircraft
in the uncontrolled space underneath. Not so at HIE, however.

Pilots should be aware that HIE is not at all unusual in this regard - it's
very common to have an MDA below 700 AGL with no surface Class E. There are
also ILS approaches with DH at or near 200 and no surface Class E.