Update I have come to a decision. Thank you to all who contributed suggestions. Please feel free to keep the discussion going to help others.
Pixel 8 Pro — minimum 7 years support and hardware memory tagging support
These devices aren’t even constructed to last 7 years. I don’t see that either of those things are worth £600 personally.
Well if the support ends, GrapheneOS support ends too. That’s why more years of support is important here.
What relevance does that have to what I said? If the physical phone isn’t going to last that long then I’d argue it is of little importance.