The problem is, once you ossify, you can't upgrade for whatever reason or extend functionality because the build tools will get lost or won't run on modern stacks any more.

Or, say, some industrial machine - you might wish to allow network connectivity so that the vendor/service teams can get notified once a sensor detects signs of upcoming failure such as vibrations. But you can't connect it to your network, or have to take it off your network once the vendor's security support has passed, because otherwise you're just asking hackers to establish persistence on the system.

Seriously! It is crazy how many software products I use have gotten categorically worse over the years.