I read several times in wise chess books (to be more exact - in commented games) - if you want to play well against some opening or some specific variation - it might be very helpful if you play that variation both as Black and as White. The same was with me about the Rubinstein variation - although it is not quite to my taste to play it as Black, all the same I practice it as Black from time to time, beginning from 4.Nxe4 Nf6 5.Nxf6+ gf!?, 4.Nxe4 Bd7-c6, and more common 4.Nxe4 Nd7, all the time wondering - why it is so difficult for White to get advantage against the Rubinstein, at the same time seeing (when playing it as Black) that Black does not have too much of winning chances either, but Black's position, although somewhat passive, is a kind of "fireproof"
What you post is correct. However, please note that after 3...dxe4 4.Nxe4 White has a N on e4 and a pawn on d4 that are both potential targets for Black. Whereas Black has no pawns or pieces on the central squares (d4, d5, e4, e5). Rubinstein understood the Hypermodern theory of chess. Control the center with the power of your pawns and pieces. This way you do not create targets for your opponent in the center.
The analysis post on the Rubenstein, and other 3rd moves by White I will post a little later.
Optimissed, noted. With you around I will have to read carefully.