Reason for not taxying off stand/starting on front stands/reversing off stands is blast damage to the terminal front + H/S, also not enough space to taxy forward off the Thirties and turn right to 'Q', what with the lighting pole etc! at least not with anything B737 size
to answer an earlier question I was told that the new pier would cater for the Thirties, and there is room north of the blast fence for a gate+walkway, just needs some more lines painted! Oh and the busses need moving!