Of course Asew was only talking about omissions about crossdressing. Nobody is asking you to tell your SO everything that goes through your head and life. Only the things that you know matter to her or him. You know very well what they are. And most of you obviously expect their SO to be aware of yours too, since there are a good lot of things that would really upset you if they "omitted" to tell you about them. Let's suppose that one day you confront your SO who cheated on you, and she/he happened to read this instructive thread and tells you it was an omission not a lie since you didn't ask, and omission isn't dishonesty, will you be cool with that? If you are, congrats, if you aren't, then your arguments are specious.
This is of the same vein as discussions about boundaries where members declare that they aren't "mind readers" and pretend they couldn't anticipate some SO's reactions about their pushing the dressing too far. Same mechanics, same results when the SO finds out.