Don't misquote me or take what I said out of context. I referenced a wheel dished off far enough to matter, as causing other issues greater than that of hanger alignment. I could (should) have added that rear wheels that far off are rare birds, and something to be dealt with if/when they arose.

Otherwise, my opinion is closer to that of A.S. You align the hanger to the wheel since the actual goal is to have the axis of rotation of the idler cage parallel to that of the cassette. Of course, if the owner changes things, it could introduce an error, but that cuts both ways, since the owner could at any time replace a correctly dished wheel with an incorrectly dished one and force it to center in the stays (not likely, but equally unlikely both before and after you see the bike).

As I said in the post you referenced it's a niggling point, but this being BF, I suspect it'll be debated ad nauseum until it descends into name calling and/or a moderator closes the thread.

I wouldn't be posting here at all, but felt I was misquoted, or taken out of context and wanted to clear the record.

BTW- I might add that the entire hanger alignment issue is overblown. Yes they need to be reasonable square, but this isn't rocket science, and no great amount of precision is needed. (the operative phrase here is reasonable aligned). Sram has for a number of years sold RD who's pantograph isn't a parallelogram and therefore the swivel axis of the cage assembly changes through the shift range. I'm not sure how many of the OCD hanger alignment people even noticed.