If you speak English and live in an area where most others speak English, then it's not hard to get by without learning the local language. People who do that often find it difficult to make friends outside of expat circles who do the same, but it's perfectly possible to live like that.
Not just that, but for example, working as a software engineer in Germany for an English speaking company means your salary is gonna be p90 among the population.
Compare that to someone who doesn’t work in IT and needs to master the language to get a decent job. All in all, it’s better to speak English in Germany
