JerryRigEverything said is his recent teardown review that Pixel repairability has gotten particularly worse on the 9. Sounded like the battery was very difficult to remove
They've also had a partnership with iFixit for a while now, allowing them to sell genuine replacement parts.
The process still isn't what I'd call repair-friendly, but I've been able to replace the screen of my Pixel 5 without much trouble. What bothers me most is the use of adhesive and too many parts being bundled together so they can only be replaced in bulk.