My ISP's router has isolation. Has had for 5+ years. Main SSID has it off so we can do LAN stuff. Guest SSID is used for IoT things and isolation turned off. Handy.
What exactly does it isolate? An SSID? IP addresses? individual MAC addresses? How does this stop a pre-infected device you purchased from shitting traffic out of your network, acting as a residential proxy or try to own your other IoT devices?
The one I've seen on ~basic consumer routers just disallows wifi devices from talking to each other at all, it won't route between them. I usually need something more nuanced personally, but it's not a bad start at all.
