GST/BAS isn't that hard
I hear a lot of people wailing about how hard GST is to sort out for the quarterly BAS. Here's an insight, if you already have your business accounting sorted out properly, and you don't let your income & expense paperwork pile up then it's typically a 5 second wait from your [BAS summary] click to getting your answer, especially for smaller businesses with simpler work-flows. Even manually it's fall-off-log-simple GST_from_income -GST_on_expenses = GST_owed_to_ATO (simple form, fractionally harder if you do export sales or have a capital expenditure).
It's not the BAS/GST's fault if you haven't kept your paperwork up to date; you'll have to do it regardless come EOFY.
(It's like people whining that they end up worse off in the pocket due to 'extra tax' when they move in to the next tax bracket; you don't, the new tax bracket only reflects on income *above* that threshold)