For which ROM to use, I believe any ROM based on AOSP will suffice because even that will fully eliminate all Google tracking, I think LineageOS is the worst one. I do recommend Pixel since you can lock the bootloader after flashing it. You could try CalyxOS.
For privacy, I only use phone for communication, I don’t use cell data service so no internet when I’m outside, no messaging, until I connect to wi-fi again. In F-Droid I turn off all anti-features in settings, and everything I install is from F-Droid. No social media and no Aurora store to use Play Store
Isn’t a GPU that pulls 600 watts in the whackjob territory?
The engineers need to get the 6090 to use 400 watts. That would be a very big PR win that does not need any marketing spin to sell.