If your business fails to take care of the consumer, the consumer takes his business somewhere else and the business dies - because it only lives on the money the customer willingly brings through the door and exchanges.
Government doesn't operate that way. Generally the budget is fixed at the start of the fiscal year, and has no relation to how many 'customers' come through the door demanding services.
The #1 goal is to get all the money spent, but not before the end of the FY (and certainly not after!). So you delay fixing the window because you might need that money to fix the roof before the end of the FY. But if you get to the end of the year and didn't need to fix the roof or the window, you have to figure out what to spend that money on because your budget person is going to be in trouble if there is money left over at the end of the FY. So you buy a thing that might not be really needed, but fits under the budget considerations you have, so it gets purchased.
I don't know how systemically, you can solve that incentive problem. Becoming more efficient and saving money with new processes actually creates the 'problem' of money you have to try and figure out how to spend. Inertia doesn't create this problem, which is probably why you see so much inertia in government entities relative to private. In the private setting the money left over is profits. Certainly not seen as a problem to make 'go away'.