I have to follow up with other moderators , but initial discussions indicated we are likely to fold Eagan Matrix discussions into the relevant Continuum/Osmose areas.
reasoning is, at present, there is little discussion in Eagan Matrix specifically, and most that we see usually references a particular instrument.
generally, the approach we want to take is to try to have more active topics and categories (whilst obviously remaining on topic), rather than having categories that are unused, and topics that have single posts.
why?
because the focus of the board is discussion/participation rather than a ‘reference site’, and over categorisation etc be a little against this goal.
edit: to clear, this is largely aimed at me 
as a developer, I love structure and organisation, so many early topics and setup here… were a bit too organised and structured, or striving for completeness or correctness…
but Ive come to realise, over time, this can be a bit stifling for some… where they just want to discuss, and also topics do wander naturally.
so, its a balance, whilst you dont want topics to go completely off-topic, and at some point branching them off to new topics is a good move, and even helps develop the discussion… it can be better to sometimes let it flow…
a good example of this is mpe instruments…
originally I wanted each new instrument to have its own topic, seemed nice and tidy/organised, and it kind of worked when we rarely saw new instruments.
but these days we see so many mpe enabled instruments… we just end up announcing them, and no one says anything more… single post topics.
here I think Id now rather we had one ‘announcement’ thread, that we could all follow, and really only get into specific topic for it, when someone has actually used it, or wants to ask questions about it…
it would perhaps create less noise on our ‘main feed’
note: I should say, we dont want to increase moderation to ‘police’ anything like this, but rather just encourage / lead by example.