Fluent Forever

Finally got through it all. Has some good takeaways. My favorite is:
Fluency doesn't mean you know absolutely every word. It is the ability to carry a conversation at a reasonable pace with few pauses. Whether it be about German cars, Russian novels, or whatnot, it is a level different to each person. As a native speaker, we come in contact with 15000 to 35000 words by the age of twenty; the same standard is not realistic for a second language.

This was a perspective I needed earlier in life.