> if your lightbulb has malware and your router doesn't yet, then using HTTPS while talking to the router is pretty important.

I agree. So what's the solution you propose?

- Using a self signed CA that you have to install on all your devices?

- Using a trusted by default CA, that makes your internal-only devices depend on an external service (the CA)?

Or something else?

I'm not saying that encrypting the traffic in a LAN is useless. I'm saying that https and the current CA system is not the solution.