If you read HB carefully, you will see where she repeatedly talks about our role in helping them to grow up
There is no denying the usefulness of HB's posts and past threads. However I advise caution against using her comments as gospel. HB is accurate in many ways but I find her comments about LBS's helping the MLCer to " grow up" as singularly unhelpful and patronising.
No expectations is referred to communication with the MLCer especially if OW is in play. It means that every time an MLCer contacts the LBS and is "nice" or "normal" it helps the LBSer to stay detached and to not read too much into any form of communication as far as their mindset or relationship is concerned and when they are in replay especially.
It does not mean that you never have any expectations - that is impossible but by learning not to expect things that would be "difficult" for an MLCer - that way lies detachment.
For example most if not, all MLCers who return admittedly return "half cooked" The "no expectations" rule helps the LBSer not to treat the R as though all is now well and place normal conventional expectations upon them. It is important if reconnection is to follow its course to reconciliation that the LBS still stands back, places no unrealistic expectations upon the MLCer and gives them the space to make the choice to return to the marriage and to learn that they have to do the work.
If the LBSer is not detached when the MLCer returns home (assuming half cooked) then expectations become an over-riding control mechanism and the MLCer either runs again or runs for good!
This is what is meant by no expectations.
Of course if the MLCer really wants back in and starts to do the work then the LBS is perfectly entitled to set the boundaries and expectations. The LBS hopefully by then is whole enough to both live with and without the MLCer.