Yes goldbox arent the best exemple, they are poor effort ports, no animation, no use of superior sound chips.
Also color palette reduction, no hardware scrolling, no copper effects. Nothing slick about them: they are clunky and janky as all-fuck.
Still everything else ,till uliima 6 or eye of the beholder 2, was Superior on amiga,. I dont know if any rpg really used amiga potential , certainly not the like of TEAM 17 , Bitmap Brothers or bullfrog.
No RPG came close to employing Amiga hardware potential. 1990 Amiga could have hosted something that evoked - note:
evoked - Diablo (using 1987 hardware). Diablo came out in 1996.
Also, Bitmap Bros. mostly buffed ST ports (if at all). And Team 17 were generic turd-polishers (though at least their games targeted the chipset). For me, the stuff with Amiga soul came from the likes of Relfections Interactive, Cope-Com, Kaiko, Ordilogic, Art & Magic, Thalion, Bloodhouse and Factor 5.