If you don't need to do anything that you can't do effectively on a 2004 machine, why would you need anything more? City employees are welcome to buy iPads and Lexuses with their own money (although it comes from my pocket, it's theirs to dispatch as they see fit), but when it comes to spending mine, they shouldn't have anything beyond what they need to perform their job function.
You know what I love? Waiting a tiny eternity while a city employee waits for their crappy, slow computer to load up a simple form so they can help me with something routine.
Next time you're put on hold for that reason, remember money spent on appropriately powerful hardware is never wasted.