Obviously I might be expected to disagree with you as I have written approving reviews of both the Rattle and the Schaller recordings but I doubt very much whether " most people now agree Schaller's is something of a washout", especially judging by the reviews I've read. I do indeed own the Layer/Mannheim version but it's not that well played or revelatory compared with this one. Nor do I at all agree with those who claim that Bruckner had little idea of how to finish or even no intention of finishing the symphony: the manuscript, depleted by filching as it is , provides too much evidence to the contrary and only the coda is comparatively speaking guesswork.
I also wonder whether the reaction of some is not bordering on the spoiled and ungrateful for such superb music-making; certain Brucknerians get very defensive and categorical about how his music should be played and apply unreasonable criteria. It is also interesting how some will attend the live performance and be transported then subsequentlt claim that the recording falls short. I'm not saying that any of this applies to you; I'm just musing - but I am a little puzzled by the wide discrepancy between the different reactions to this one.