Exactly. The community is involved in the strategic planning process, and has the opportunity to review the spending and changes over time, both through the visible elements of annual planning and the annual reports. In addition, there is (obviously) pretty robust discussion here when questions arise about priorities. I don't know that a new stage of budget development of "community feedback" would be very useful.
Many people may not be familiar with what an in-process budget for $30m+ of spending looks like, or how they arrive at the final product (which is usually presented publicly, and even internally at higher levels, in a summary format). It simply isn't reasonable to expect that anyone outside the WMF is going to have meaningful input on the minutiae of budgeting. Time and attention of community members is best spent on FDC proposals, strategic planning and Board elections - and the levers for those roles already exist.
~Nathan