I also have the Pixel ... but what you describe is not a problem with the device, but rather a possible problem with Gboard (the keyboard). Try to wipe the app's data or at least reset the personal dictionary. If not fixed (and I doubt you'll need it), just replace it with AOSP's version without the AI/learning shit (albeit you'll miss swipe entry). That'll do it.
About the screen brilliance thing, are you sure it isn't a software issue? Like you turned on sRGB Mode in Developer Options or played with the settings? If in doubt, unlock the bootloader (as you read El Reg, I think you already have), install or just fastboot boot TWRP, backup /data, wipe, and see if it fixes it.
However, it could just be AMOLED artifacts (like burn-in, got that on mine too).
Biting the hand that feeds IT
