As someone who has had to manually satellite TV dish, AFAIK, there's always guidelines on the specific angles you need to orient your dish at. Couldn't an adversary place satellites to also broadcast noise in roughly the same direction?
In contrast, the Starlink satellites are zooming around the planet orbit once every 95 minutes[1] or so. At any given time, there are many Starlink satellites "visible" and the antenna tracks them using a technique called "phased array antenna tracking." This is the same way multi-target RADAR works on modern ships and planes.
Anyway, the cool think about Starlink (I just installed mine) is that you put it up where there is a lot of "sky" visible, and then the antenna moves itself to maximize the area of sky that it's antenna can "see". It is very cool and an amazing bit of engineering.