TV you need a little lesson in Geography.
Brisbane is a lot north of Melbourne plus a lot further east.Both those facts mean the sun sets earlier in Brisbane than Melbourne.
As an example on Christmas day this year the sun will set in Melbourne with DST at 8.43pm.In Brisbane without it it will be 6.44 pm.So if Brisbane had DST the sun would set at the same time as Melbourne without it.So really not much point.
Besides the best time for physical exertion in QLD is early morning when it is cool rather than late in the day when it is usually very hot and humid.
Another example to show the difference geography makes.Cairns is a lot further north than Brisbane so making an earlier sunset.But it is also a lot further west than Brisbane making it later.the result is virtualy the same time of sunset-6.51pm on Christmas day.