Few years ago, you built a weather station. Sadly, the weather backend you had was discontinued. You found a great new one, and it even comes with SDK and sample code! Sadly, the SDK requires python 3.8 or later. Does your device support it?
Few years ago, you built the home automation server. But recently, you got the set of remotely-controllable disco balls for each room which use FOOBAR protocol. Good news: Linux kernel supports FOOBAR protocol since 5.14. Bad news: your device kernel is much older.
Few years ago, you built the smart controller. You don't want to manage your infra, so you decided to go with AWS IOT, it is super each if you only have a few devices. But AWS announced they are dropping AWS IOT.. does your OS support newer system?
There are definitely cases when you set up the device once and never have to touch it again, but there are also a lot of networked things out there, and you often want to control them..