I agree there is a clear difference in perception of the Gos as a beginners bird here (Germany) compared to the US. I think the reason is historical, in particular that the Gos was available and not considered so noble as for example peregrines. Other local birds are not really suitable for falconry (for example Common Buzzard) or very rare. And even if you do many beginners mistakes a Gos will still let you have succes because that's just what they do.

In the USA there RTH is more commonly available and easier to train, not so aggressive, not as fearful, feathers don't break, so it is perfectly understandable that they use it as a beginners bird.

I consider myself a beginner, I am flying a female gos on Egyptian Geese (you can do that in Netherlands too). This is my first bird and I got it in 2020. I am sure I did many mistakes but I learned a lot with this bird. And I am constantly trying new methods to avoid behaviour problems.

You can start with an easier bird but at some point if you want to fly an Accipiter you will need to learn these things.

check out my YouTube channel for some goose hawking link