Cameras, I only care for quality and Real-Time Streaming Protocol aka RTSP. I don't care if that device will never see internet again, I can use it until it dies and I cannot fix it.
My Asus wireless router running OpenWRT, it is no allowed to touch the internet itself, it is just a dumb access point providing radio, nothing else which again, I can use it until it dies even if OpenWRT projects is shutdown.
Found out recently that I can actually install/remove apps from my Samsung smartTV running TizenOS using my Linux PC by exploring is developer mode. Add a few more years to its lifespan.
I know I can hack into my robot vaccum but haven't had time to do that yet.
I run Linux everywhere at home so does my homelab and 3D printer.
IoT are blocked from accessing the LAN while OPNSense allows me to talk to them. Block everything by default until something breaks.
The ones I cannot take control like my Broter Led printer, I just block its LAN access to prevent the manufacturer from acting like HP, I can still use its network feature but not the other way around.
Just like that, your devices will last way past a decade, you have full control, you have security measures in place, and spending is virtually null, buy it once and use until it breaks and you cannot fix it.
Great idea !