I doubt all non-gpu drivers are open source. We're talking oneplus right? If they are, people still need to port them to the new non-stock-compatible OS. Then

I doubt all non-gpu drivers are open source. We're talking oneplus right? If they are, people still need to port them to the new non-stock-compatible OS. Then you probably need to compile everything yourself. Then repeat when OS gets updates. And you'll still be stuck with the stock bootloader and baseband firmwares. Which will hardbrick your device if you flash the wrong way. But yeah, totally accessible.