The person missing the point is you. I made a very specific and direct claim: non-native speakers of a language who learn the language after they reach their mid-20s or later will almost always remain distinguishable from native speakers. It is a claim backed up by a ton of research. If you want, I can start citing it for you.
You are arguing that an adult can achieve fluency. I have not denied that nor have I made that argument. You have agreed that you yourself are distinguishable from a native speaker of the language you learned.
Whatever strawman you want to argue against, have at it. But you've actually repeatedly conceded my point.
You were clearly referring to the command of the language.
You said, and I quote from post #525:
There are some idioms, expressions, pronunciations, or what-not that will keep them flumoxed (sic.) for life.
In my original post I showed you that I'm not flummoxed by idioms, expressions, pronunciations, and what-nots. Attacking a strawman? I demolished your post.
Then you started using the pretex of the accent, but the accent has nothing to do with the language (and that's what we were talking about) or with the semiotics (that your argument was originally referring to).
p.s. Changed his username to Adreline_Junkie:
http://www.chess.com/members/view/Adreline_Junkie