Absolutely. I am a big believer in using mature technology that still works. No need to re-invent the wheel every time you want to roll something.
One thing not mentioned is these tethered platforms close the airspace around them, unlike a 2500’ tower, You can see and avoid the tower, that cable is all but invisible, and the wind moves it around from day to day.
That tether is high tech magic, and it can bring baby home in bad weather.
Global Hawk is not ready for primetime and is expensive.
It is a waste of resources for a fixed border.
Which is why the U2 is still flying after half a century and Global Hawk is not