If it was/is routine work then why did those things get into such disrepair? It is obvious that the additional TLC work was badly needed. The "routine" work is getting done, but the "things that really need doing but nobody is pointing them out" aren't getting done. It is wrong that it took one person to find those issues and it is bad that now he has moved on to a more senior role they are back to not doing enough of them again.
If it is routine then it should be scheduled, so every four years, replace the Mutiny Bay banner, every two years clear the ivy from the Haunted House façade, make it into a scheduled routine. But it is obvious it isn't routine work and it isn't being done. This stuff should be routine "TLC" and there should also be the "large scale" refurbs such as were done on Hex and Duel (I'm not getting into the debate as to whether the budget was good enough for them to actually be done to a high enough standard)
Back to the topic of new investments, the park should have a low year where things are completly rebuilt, same as you can see that Disney and other large parks do, they have routine maintance every year, but every 5-10 years the ride closes for a full strip down and re-do.