Ship class questions

I can understand the purpose and role of most of the default ship/structure classes, especially military, but some have me a little confused.

– EHB C04/B80: These are listed under “Extraction” but don’t actually do any extraction, and just seem to be a docking bay? I can see maybe they could be used to consolidate a bunch of smaller extraction ships together, or provide jump capability for them, but it seems that any role I’d put them in there’s better options.

– MCS S11: This seems to be a self-contained Spare Parts manufactorum at first, but it actually isn’t – the parts list doesn’t match up. Is this just a result of some ingredient rebalancing, or is there another purpose to this class as-is?

– Refinery structures: Are these designed to be used alongside Extraction Facilities and keyed for a single type of refining? It seems then that there’s a missing class of “Manufactorum” that would be for just factories (as opposed to Manufacturing Core and Belt Stations which both already include refining). I have used them to make product-specific factories, but it seems a bit weird when they’re in the fleet list as “Refinery B” and they’re making engine parts.

– General Belt Stations: Why do these include Accommodation, and what’s the logic of building one over a Manufacturing Core which seems to be quite similar (more shipyard, slightly less refining, no people)?

It might also help if you shared a little of your design philosophy with regard to the included ships – maybe a “Notes” field against the design template that could include a couple of sentences would be useful? I would also like to understand the thinking behind some of the ratios of defense equipment on certain classes if that is possible, as it becomes much of a guessing game when designing my own classes.

For what it’s worth, if any other players see this and have designs made for specific purposes, I’d love to see them!