I think the problem here is that she wants to please him as well as him pleasing her but suspects he is not getting as much out of the relationship as she is and that concerns her. He may enjoy submission but if his submission comes at a cost where he loses his sexual pleasure as a result?
The point of journalling is that some subs feel more confident expressing themselves in writing than they are verbally. You are clearly more confident in verbal communication (many women are, especially when it comes to talking about feelings) but many men don't like entering into an intense conversation about emotions because it is a battle they never win (and, yes, I know it is not a battle, at least not to a woman's PoV but it is endemic in the male psyche to see everything as a challenge and things which threaten to burst thier ego should be avoided). So, sometimes, a written journal can be beneficial because it allows more honest and open sharing of feelings. Also, you can get a deeper level of reflection and consideration when you write about something a short while after it is done than you can talking about it immediately and the Dom/me who reads the journal has more time to consider and reflect on it.As for journals...it seems to work for some...its never worked for me, (mainly becuase the dominants that ask for them expect somthinng that they could have got by simply asking, redundancy doesnt accomplish much or change my answers to questions), and most likely if your not hearing what you wish to hear from him in real life, dont expect to suddenly start hearing it in a journal. In fact if anything, in my experience, submissives have a tendency to eaither use the journel as some kind of topping from the bottom tool, or they write what they think the domme wishes to hear or some combination of the two.
Plus, an added side effect, the sub has a physical record of their development as a sub and the Dom/me has a record of their development as a Dom/me (both in thier own journals and those of their subs). You can go back and look at previous entries and see a definite change in attitudes and practise.