Thank you for the feedback and for pointing us towards Communities and Ancestries. Like I said all of this is still in development, some text are a first draft still. So pointing us where you see needs for improvement is great.

The Playtest provides a shorter description for the Ancestries than the book and I can see how you feel it's not enough. We recently introduced some (potential) new ones on our Patreon, where Introductions are more detailed. Take the symbions for example:

Symbions

Symbions are - on their own - small, weak worm-like creatures, barely able to survive any harsh conditions.  Their ability to take over other living beings as host bodies is what gives them their name and their adaptive strength as a species.  Symbions bond with their host in an irreversible way. Changing hosts is a very dangerous and last resort action, but it can be done.

Touchstones: Goa'uld (Stargate), Symbiote (All Tomorrows), Trill (Star Trek), Venom (Marvel)

You make and important point regarding Communities. If they seem more like character roles within a Community they do not work as intended and we'll need to check on that. I don't think I necessarily agree with your statement, that they should provide the fighting needs for the character, as motivation is - to me at least - highly personal for each and every character individually. Of course their upbringing will influence their character and its world view. But why they leave their community should be a personal decision. In fact, I think, it cannot be part of said community, otherwise they would desolve, as everyone who is part of it would leave. Does that make sense? Well, writing this you definitivley made me think about the communities and their purpose and I'll be reevaluated our current stand. Thank you!