The current practice and quite frankly the OECD best budgeting principles dictate presenting the budget prior to the fiscal year. Parliament should vote prior to the fiscal year, because afterwards spending is already taking place. Plans are already in place. It's really difficult to make any changes or commentary on things that are already taking place.
The current process does give an amount of money for government to operate by Parliament for the first three months. They will be doing that, just in a slightly different way. As they note, some other jurisdictions have a similar process. They need to have some funding to start the year.
The real issue for Parliament is the ability to analyze budget and estimates information. The interim estimates and interim supply are not given a lot of attention by Parliament currently anyway. Having interim estimates versus interim supply won't affect Parliament a great deal.