So, responses:
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Yeah, the “Precursor” skillbooks can easily be segued into being the reason we could begin to use other precursor techlines by saying that they contain libraries of auxiliary info, all compiled by the Triglavians - something I wrote descriptions based around, actually.
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Precursor stuff being Tech I and II has its weirdness, but it’s reasonable too - Tech Level is more of a tech “type” than a power category (e.g. tech II uses morphite, tech III uses reverse-engineered Sleeper tech and copious fullerenes, and abyssal modules were for a time being considered for being called tech IV), plus the stratification would definitely be confusing for newer players in terms of “how strong is this thing”.
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Angel ships (yes, off topic I know) are another fun thing, but I’d wager that the main reason we haven’t seen the rest of them (which had descriptions added a number of years back, describing their roles) is that other pirate factions don’t have and wouldn’t have equivalents - precursors seem to be more focused on being whole shiplines, as opposed to the pirate/non-empire ones.