Given that ipv6 addressing often includes the outbound link (e.g. 26:01::02%eth0), I feel like it may not be required perhaps but also it could in some cases be

Given that ipv6 addressing often includes the outbound link (e.g. 26:01::02%eth0), I feel like it may not be required perhaps but also it could in some cases be helpful to have different devices for each. It's all heavily virtualized nic stuff anyways so, I guess I'd ask: why not?