I have a slightly different view of the R process, but I end up in the same place.
IMO, it's entirely reasonable for the WS to have requirements for R. It shows involvement, and R is much easier if both partners are actively and honestly involved.
While I think it's reasonable for the BS to consider changing, if one partner does not want to make the changes the other partner wants, that's a great signal that the M won't work.
My W has wanted me to make some changes ever since we started up together. That's 59 years. Not deal killers because 1) it turns out I benefit from the changes she wants; 2) she acknowledges that I simply can't make some of the changes she wants; 3) she loves and accepts me as I am, change or no change (and vice versa).
As for requirements, I feel fine doing what she requires of me, and she feels fine giving my what I require of her.
If we did not fit together as well as we do, we wouldn't have gotten married, and I wouldn't have chosen R after her A.
In some respects, this is just me and my ways. In other resects, though, I suggest emulating these ways: if you and your partner do not fit well enough together, my reco is to split.
fBH (me) - on d-day: 66, Married 43, together 45, same sex ap
DDay - 12/22/2010
Recover'd and R'ed
You don't have to like your boundaries. You just have to set and enforce them.