Then, why should Parliament be expected to hold the government to account without similar leverage? Is not the purpose of government voting on these funds the fact that.... We're in a majority government right now, so granted it's unlikely that this Parliament would refuse this government those funds. It may happen; it could happen, if you have a good process. It doesn't mean it will happen.
However, in other situations where the government doesn't have a majority, presumably this kind of information would be very valuable to parliamentarians who do have the opportunity to deny certain funding to government.