It’s great on the bottom and seems like it’ll last the rest of my life.

No pillow is going to last 10years. Your brand recommends changing every 2-4 years depending on the type, of course they are biased to make that number lower, but you still are going to be hurting yourself if you leave it too long. If you wake up with a stuffy nose every morning that could be your pillow for instance.

If longevity is your biggest concern I would recommend something like a buckwheat pillow, when it ages out you can just replace the stuffing for cheap and the waste buckwheat is fully biodegradable. I love mine!