I fully agree. I'm convinced the issue with the JLs is water is getting underneath shitty paint and corroding the aluminum. Take a look at some early model JKs. They're pissing white all down the doors from the hinges.
There are some pictures floating around where there is very likely something there and not just painted over. Like I said though, no one has actually shown a picture of what they've done.Love to see a picture, too. From what I've seen (2020 JLUD - taking doors on/off probably 50+ times), the hinges are bolted directly to the body and door. No gaskets between them.
If you're talking about where the pin/bolt connects the to halves of the hinge, there IS an insert of some kind to prevent paint-on-paint rubbing as you open the door. I can tell you from experience that these do break over time, but mostly (in my case) from bolting on mirrors and foot pegs.
Ultimately, mine is 2 years old with 40k miles, and I have no corrosion.
I saw an early 2010s JK recently in a parking lot that was SO bad in this regard, it was literally cringe-worthy. The rest of the Jeep looked fine, but the hinges, and the areas around and below them, were a total mess.
