Closing the deck or O ringing would fix it but be more expensive. They seem to have been going the cheapest way which would be a gasket capable of taking movement.
This also explains why engines often fail on a long trip. You get into another whole level of heat soak then and my thoughts are that the liner moves then.
The point of this thread was to try and help people to understand the nature of the beast.
Yes, there are very expensive ways to "fix" the problem, but not realistic for the every day driver.
I think the best that the every day driver can do is to understand and accept the "problem" and make their decisions as to how to minimize unwanted break downs and engine failures based on the nature of the problem. Rather than based on statements like "The updated gasket fixes the problem". Subaru never told anyone what the CAUSE of the problem is, or that the updated gasket was designed to FIX the problem. They just gave us the "updated gasket" and stoped making the engine. Just seems fishy to me. There has been enough dissapointment over this engine as it is. If it turns out the problem is engine design that a gasket can't fix, there is sure to be a lot more dissapointment.
Make informed decisions. If you like the car your driving and want to keep it..............................
I say put the "updated" gaskets in, your engine, or a rebuilt, hope for the best, but don't rule out another failure.
This is the approach I take, and everything that has come up in this thread so far tells me that it has been a very good decision.