Not everything needs to be connected to the Internet, and not every micro controller is running a non-mission critical task.
A micro controller hitting a memory safety bug that causes the LEDs to present invalid output can have real world consequences. Even if the micro controller isn't directly actuating machinery, it might cause an operator to incorrectly act because they were mislead.
If the micro controller is running Christmas lights, it might be fine if it falls over, no one will die, but I would still call that a manufacturing defect.