Once the six-year support period for the mentioned Surface devices ends, they will no longer receive driver or firmware updates. Essentially, when a new version of Windows is released, firmware updates ensure the hardware doesn't have any compatibility issues with the new operating system. This is important because each of these devices will remain functional and you can continue using them as you do right now. These devices will also continue to receive Windows 11 updates, including new OS features. However, if any of these future Windows 11 updates break anything specific to these devices, Microsoft will have no obligation to fix it.