1) Municipalities aren't allowed to run budget deficits, so whenever there is any sort of economic downturn and revenues are short of what they projected, maintenance is often the first thing to get cut. They call it "deferred maintenance" but in practice it's just a disguised form of borrowing because you need to do it eventually and it's only going to get more expensive, which is effectively a different kind of interest. In contrast, whenever revenues exceed projections, there is tremendous pressure to just cut taxes rather than build up any kind of rainy day fund.

2) The existence of cities like Highland Park and University Park. These are entirely contained with Dallas city boundaries, small, and near the city center. They seem to exist for the sole purpose of taking all the largest and most expensive mansions and a few associated shops and public services, and walling them off from the rest of the city to make sure the wealthiest people don't see any of their tax revenue going to benefit anyone except themselves.