The problem is that sometimes there cannot be growth without expenditure, regardless of whether it is funded via other growth, cuts or whatever.
I've used this example on another post but childcare costs are one example. Childcare is very expensive, expensive enough that it's often financially better to work less hours than pay for childcare whilst working. The government can plug this gap by subsidising childcare which means people work and are more productive
There are also the railways, how many hours of productivity have been lost over the last 10 years due to late or cancelled trains? I can remember the city parade last year, we had to leave 2hrs early because every train afterwards was cancelled. We otherwise might of spent more hours in the pub, so lost income for the pub.
These are just anecdotal examples but critical infrastructure is not an optional expense. We need to get back to basics when it comes to spending. IE, get transport and the main things working, then make hard decisions to strip away anything else that is otherwise optional and let's see where the financial blackholes are then.