My dream is a user-friendly network-level firewall of some kind which can selectively block requests to domains on the entire network level. Something like uMatrix but for your entire network.

Imagine being able to block `ads.google.com` or whatever from all of your devices at once but without having to rely on local DNS. Or being able to block `pornhub.com` from just some of your devices but not all of them.

I assume the technology to do this is readily available in the form of parental control software or enterprise/office firewalls. However on the consumer level I don't know of anything which does this effectively.