This is a very sensitive topic. I think anyone moving to a different country has to learn the native language. That's the biggest barrier for proper integration and to feel fully at home in a new country. Whenever something is broken, needs help or in an emergency one cannot expect to have an English speaking person on the other-side.
That being said, German is not an easy language to learn. In my experience, native German speakers are quite patient and help you with practice compared to let's say French, still it would take ages to be fluent in German unless you're studying the language full time. However, if you're a skilled worker you would be working in an environment where English is used and the amount of time you'd get to learn German would be way less.
In that aspect I think Anglosphere is way more attractive for migrants to settle down and it's natural people would come to Germany, work, save some money, travel around Europe and move on to US, UK, Australia, etc. to settle down.
That being said, German is not an easy language to learn. In my experience, native German speakers are quite patient and help you with practice compared to let's say French, still it would take ages to be fluent in German unless you're studying the language full time. However, if you're a skilled worker you would be working in an environment where English is used and the amount of time you'd get to learn German would be way less.
In that aspect I think Anglosphere is way more attractive for migrants to settle down and it's natural people would come to Germany, work, save some money, travel around Europe and move on to US, UK, Australia, etc. to settle down.