Even a case of a police officer firing a beam at a car to determine its speed... that's causing change. The photon hits the car, the car absorbs evergy, and the conditions have changed (albeit in an immeasureable way).

When you realise that in order to measure the velocity and trajectory of a partcle, or even a large physical object such as the moon, one needs to at the very least fire photons at it, then you can start to see that you're changing the conditions in which the object you're measuring was intitially subject to. Yes, in a tiny manner, and for all practical purposes on the macro scale, the change is zero. But it's not actually zero. When we get to the quantum level, well it becomes much less nelgigible.