I am not saying that this is the case here, simply that this is a possibility and Intel really cannot do anything about it. In many cases, changes to the Video BIOS (or driver, in the UEFI nomenclature) that are important to their runtime drivers are released by Intel, but, for older products, vendors like Dell will ignore these updates and not include them into a BIOS update.
Unfortunately, because of the costs involved, Dell, like a lot of companies, abandons their products as quickly as they can. It is thus important that the BIOS be up to date. This can materially affect how the graphics engine operates. The BIOS initializes the graphics subsystem to use it itself.