It's probably relevant due to companies usually dump EOL hardware, and some of it gets a new life in a non-business environment. But if it needs a firmware update for a security vulnerability you're out of luck. There is legitimate commercial market for used EOL hardware as parts for people that keep old hardware a bit longer, but that's probably short term until it can be replaced.

There really ought to be an “open source your drivers or offer a refund” law for companies that want to EOL devices. It isn’t the 90’s anymore, hardware innovation has really slowed, a chip could be good for decades.

I bought a TV on deep discount. The Android TV OS was already trailing-edge and soon went unsupported. Being just a little paranoid, I monitored the network for continued activity after I removed the network configuration from the built-in software, which I replaced with an external device that's fully supported. I doubt many of the other customers for this cheap TV are as vigilant.

But no one should be buying or using these devices when they are brand new. Why would I care about them when used?