If you are good in one mainstream language you will be good in any of them. And by good I mean, can you think about a complex problem and implement an algorithm

If you are good in one mainstream language you will be good in any of them. And by good I mean, can you think about a complex problem and implement an algorithm to solve it. Don't listen to the haters that say Microsoft tech users must have no curiosity or other such nonsense. Like you think there aren't people working at Microsoft solving crazy problems at scale and that other companies aren't drooling over them?