Wow, I just heard Hamelin's recording. Splendid! His recording does not incorporate the posthumous etudes, and I feel the work is so much tighter without them. Schumann's final thoughts were IMO correct.
Well of course those extra etudes (variations, really) are glorious, but Schumann never made things easy. For years pianists have tried to find a way to incorporate those extra thoughts, but I've never heard a convincing solution. Generally I've found that the addition of the extra etudes simply ruin Schumann's architecture, and worse, the piece simply becomes too long to sustain interest. Kissin's recording is a great example of that.
No win situation, alas. I played this piece on my final recital as a pianist (without the extra variations) and it still remains for me one of Schumann's most glorious piano works. Our good mate Thal won't agree, but of course he has not played it, not that it is any concern to him.
Yet Schumann has his share of 'bombs', the 1st symphony ('Spring') is one of the most utterly tedious and uninteresting pieces of music I've ever heard, the last movement in particular being a total waste.
Funnily, driving in the car this afternoon I heard Schubert's 2nd symphony. I enjoyed every moment of it, great stuff, far superior to any Schumann symphony.