Ease of managing multiple OpenWRT devices is still its weakest link. OpenWRT is device centric, but I don't want to managed devices, I want to manage a network.

Modern mesh WiFi systems I've seen do that so well. I know in theory that I could create a VLAN + SSID on my OpenWRT router and APs just for iot devices to only access the internet. But setting that up on a TP-Link mesh was a couple of taps in their app. Doing it on my OpenWRT devices would be quite a bit more hassle.

Thinking about this more, I doubt I'll setup any OpenWRT APs on my network going forward. Most of the things I like about OpenWRT, and need it for, are related to being my router. My OpenWRT APs are just "dumb" APs. Wifi is off on the router.

For the APs, I could use a mesh kit like the TP-Link Deco unit I installed for a friend recently. Super easy setup, reasonable price (cheaper than equivalent OpenWRT hardware I'd buy), wired backhaul up to 2.5Gbps.

There might be a workaround for some people - get a big openwrt switch.

Openwrt supports the zyxel gs1900 switch, which goes up to 48 ports.