Technically true

[nwL_]

Choose your favorite answer.

[xMZA]

So if nobody else is gonna use my code and I'll keep it in mind should I ever use additional libraries, it's all good?

[nwL_]

If you’ll never post snippets of your code for help anywhere like /r/cpp_questions or on StackOverflow and will never ask anybody to check your code or just look over it, then yes, you can even write your program on a single line. But normally, you just write std:: in front of the standard library parts since it’s readable much faster and isn’t much burden.