Going by your story and your alias, I’m familiar with your issue from the other forums you posted.
If you are truly looking for other Outlander owners experience on this forum, beyond another forum to vent your frustration with the car and Mitsubishi, well, there aren't too many here; just myself and one other member as far as I know.
While I have few PIN HEAD sized chips on each side, just above the clear film and one or two on the lower part of the doors, from BEFORE I installed the mudguards, obviously the extent of the damage is far from what's shown in your pictures.
I drove my Outlander on the highways and the city roads in Toronto area every day for the whole winter and this is all I've got, not to mention that due to the winter conditions this year, the salt was almost a daily presence on our roads.
I have a very hard time to believe that you got all this damage from driving on the highways, unless you were going through a lot of construction areas.
I guess there is no need to repeat here that there is a solution to prevent this problem and many suggested this solution to you already.
Yes, I too blame Mitsubishi cost-cutting decision not to include the side door garnish standard on all Outlanders in North America and not protect more area around the rear wheel wells with clear film, but that's another story.
To put it in perspective I can use $267 (which is exactly what I did), out of the thousands I saved compared to other compact SUVs on the market, toward fixing this potential issue. I say "potential" because I didn't reach the point to consider this a big issue. This is the reason I didn’t even rush to install them.
In your case though, due to extensive paint damage shown in the pictures, I would paint the doors first before doing anything else.
The body cladding you saw on the Japanese models does not come standard or as a factory option; they are an accessory catalogue item.