My Pixel 3 stopped working because Google fucked up it's kernel boot and mechanical design. They placed a laser focus IC, that's a bare die mounted on a tiny FR4 shim to get it closer to the backpanel, on top of the main PCB. When this tiny laser focus IC inevitably breaks off or loses contact with the pads due to mechanical forces on the back panel, the Pixel 3 linux kernel ends up panicking during boot because the driver can't communicate with it.
I could see this because I had the bootloader unlocked before it bricked and could get the boot logs coming out. In fact it could boot into recovery just fine too but what a PITA to fix this at that point.