Hello
Reordering the legend alone may have some use but is unimportant given the only the active layers are printed in the final legend anyway (and my director asked for a template without the legend because the existing format is messy anyway).
In Exponare there was a feature to reorder the layers. This could be useful where a solid layer is above another layer. At the moment we can make the solid layer translucent but with things like the Local Environmental Plan maps, there are actually State government imposed style guides on the colouring and ideally for uniformity and readability purposes, you probably wouldn't fade out those layers (for example)