Yeah, I also get mad when someone takes a functioning piece of equipment and remotely turns it into e-waste, forcing me to buy a new one
When Linux dropped support for 486 did people rush out and complain about remote kill switches?
No, your Time Capsule (if you even have one, which I highly doubt) is not going to become e-waste. You don't have to upgrade macOS, and if you do, there are options to make it keep working.