Designed for repair?
I've worked to fix Google phone for years now, the earlier Nexus phones were relatively easy to open and repair but these days phones are not definitely designed to be repaired. Just replacing the battery can mean a complete disassembly, removing glue and tape internally and then juggling wiring around internally to get the old battery out. It's common if then reassemble the phone and find that it will not restart because something else got broken in the repair.
This is a design feature - phones are built to live a few years and then make the user buy a new phone. Users are just Google's food.