This is what happens.
Someone higher up, executive level, decreed that grass be replaced where possible, with turf. Perhaps based on feedback from Park Ops, perhaps not. Landscaping / Ops outlines the areas they could swap, to meet the mandate, making executive happy who approves the project, and they complete the task assigned.
Now say WDI comes over to start a refurb of Mansion, and perhaps the lead of that project wants to restore lawns back to real grass, but then finds out this was an executive decision, and so when they present that part of the design, there is no approval given to restore the lawn...
As such, WDI moves on to other approved aspects of their project, and the cycle continues.