As someone (you?) said elsewhere, it couldn’t be less helpful if it tried.
While it is true that I wouldn’t dream of booking a cruise because of the possible speakers, the pleasures of anticipation would undoubtedly be much enhanced for me and, I suspect, HH by the knowledge that, say, David Gower was to speak.
I think the lack of ability to make dining choices may be because of your guarantee booking. After all, there is always the very unlikely possibility you will end up in the Grills and won’t need to make a choice. 😀