There are configuration files that divide the world up at a regional level (eg ‘North America’, ‘Europe’) that can be used by devs to determine availability of airport services.
If a scenery developer alters one of these, perhaps with the good intention of excluding push back carts at an airport that wouldn’t ever have them, it will determine services for the entire region - so suddenly no push-back carts.
It’s bad practice and scenery Devs shouldn’t do it. If Devs want to block pushback trolleys or marshelers from appearing at small or bush strips, then better to set the parking spot to a ‘GA Dock’ type.