The original question.
they mostly go for a 'mini back track'. IE if cleared to line up at 34 Juliet in MEL, rather than taxi out and do a 90 degree right turn to align with the center line, they follow the lead in line to the south before lining up with a 110 degree (or more) turn to the north to line up.
An answer.
I think to reduce tyre were and stresses the most correct.
An opinion:
I can't see that a mini back track, followed by a turn of
> 110 degrees can reduce tyre wear or undercarriage stresses, compared to a 90 degree turn.