Beyond all the usual teardown detail, there are two things of note worth a look in the iFixit article:
In Step 6, you’ll see a modular SIM card reader, much easier to replace and not requiring a logic board swap. Small thing, but interesting.
Much more interesting to me, take a look at the image in Step 3. There are two major differences between the iPhone XS, on the top, and the iPhone XR, on the bottom. One difference is obvious: The XR has no antenna band. But can you spot the other difference? It’s quite subtle.
Rather than spoil it here, I’ll post about it in a few minutes, when I get to the Daring Fireball iPhone XR review roundup.