Example config linked in readme! My ISP doesn't offer IPv6, so it might not fit your use case well, but it's a setup with multiple routing tables (one for vpn, one for direct internet access, one for no internet access)+multiple network namespaces (default namespace has the vpn interface, wan namespace has the vpn socket)+configured dnat/port forwarding which is hard to get right in such setups. It also takes port forwarding rules from another system's config, which was always my dream before even starting this project lol
"framework" is really the right choice of words because while it's well integrated with itself, it forces you to use itself, it doesn't integrate with networking.interfaces because it itself is a more featureful variant of networking.interfaces.
In my experience, this let me focus on writing the router itself, while previously half the time I felt that NixOS just doesn't provide enough customizability for routers. However, I don't offer many features right now, only device config/network namespace management/bridge creation/veth pair creation/dhcp/router advertisement/wireless access point creation. Obviously, there are many cases for which this won't be enough. If this isn't enough for you, open an issue and I'll try to add what you want (or better yet, do it yourself, as I probably wouldn't be able to test it).
Rosa is the author of "The Accumulation of Capital", which was called something like "theory of the automatic demise of capitalism" and opposed in the USSR.
The book basically says that capitalism is impossible because equivalent exchange of value means there's nobody to buy the products, and survives by appending more and more regions to the capitalist system, which allows unequivalent exchange. Lenin (and later Soviet Marxists) opposed it for being anti-revolutionary. It downplays the internal contradictions of capitalism in favor of the nominally anti-imperialist external contradiction analysis (which in itself is bad for framing it as a matter of fairness), and that devalues the revolutionary class struggle, even if that certainly wasn't the intention ("automatic demise of capitalism" implies there's no historical need for that), ironically it was also used for opposing national liberation movements under the pretext of it being impossible to strive for national interests without having to become an imperialist (this is basically KKE's "Imperialist Pyramid" line).
Sadly, this means there's plenty of "Luxembourgist" social fascists.