> Are you suggesting that people should buy both a router and a firewall for their home networks?

I am suggesting the ER7212PC is not a home network device, and thus having the two functions glommed together is an anti-feature in its design. The tagline of Omada is "Networks Empower Business":

* https://www.omadanetworks.com

Expecting that a router to not-route IPv6 by default is to misunderstand its purpose.