Tell that to all the people with 820-2850 boards and 820-2915 boards that come with a processor with integrated graphics.
Show them how to switch to the Intel GPU.
I'll even send you 16 of mine. $100 for each one you can "switch"
You're stuck.
I do intend to eventually try putting them into a debug mode via hardsetting so that it uses the Intel GPU only, but this is for another day.
Unlike a Lenovo where you can switch in the BIOS and completely turn off your bad card(I killed mine for fun mining litecoin just to see how long it'd take), you're kinda effed on a Mac. You can't just push a switch and oh, it works. If the dedicated GPU goes, your laptop is very F'd & won't be booting.
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They don't all die, but a ton of them do die.
3 years for $300 isn't enough. They die right outside Applecare.
Go integrated if you value longevity.