Something WinUAE has over real Amigas:
Lotus III runs silky-smooth under WinUAE with activated JIT. It doesn't on Amigas.
Also any cheap PC can run "Elite II: Frontier" emulated via WinUAE drawing the polygons at 50fps with max details whereas you really need a very expensive Amiga to accomplish that.
Still WinUAE can't emulate the sense of nostalgia which real Amiga hardware delivers.