This is a real worry seeing as this App is very basic stuff for an NPA.
10nm (9.6 close enuf)starting at 3000', 3 deg's slope it's about the same as any std ILS to a seal lvl drome.
If these guys where at 2500' then as long as they where within tracking tolerances laterally you start down 3 deg's FPA just coming up to 8 miles & tick the boxes as you pass each dist/alt step, much like multiple outer marker check heights on an ILS. sheeeeez it doesn't get much simpler than that!
Too much automation has numbed the mind as these guys can't think outside the box !
Wmk2