I have a long list of UOA's at 4k miles on both my honda's documenting fuel dilution since the day I bought them. I knew what I was getting in to. Heck, I had fuel dilution, although not to this extreme, on my older J35 in my long sold 17' accord. The GDI definitely just made it worse. My theory is this:
To avoid carbon build up on the valves, the valve angle and injector angle was designed to allow SOME spray onto the valves at SOME points of the combustion cycle at SOME RPM. Although honda has mentioned this, and no serious reports of carbon build up have come up, as well as some engine tear downs have shown things to be okay in that regard, this comes at a cost that the injectors literally are spraying some fuel on to the cylinder walls. This can't be completely mitigated in GDI systems, but can be minimized. Seems what ever honda did with their geometry caused this.
I change my oil every 4000 miles, but I do 99% highway mileage and still get anywhere between 2.5 and 5 % fuel dilution.
The reason I buy honda's is because I know how to work on them, not because they are the best engine's or cars out there. For long term reliability and care free maintenance, buy a toyota, I have several, and I don't even bother doing UOA's on them after 200k+ miles because I know I don't need to. Every honda I have had (and I have had many) is a finicky thing that has a temperament, (some enthusiast call it a soul, but its also known as a PITA). In the 6 speed days, some people never changed the transmission fluid, some did, on mine, it didn't like going over 30k miles without a trans fluid change, the moment I changed the fluid, its like a child on sugar, feeling peppy and energetic. The oil changes are the same way. Same with the valve adjustments. Some people literally go 100k miles without a valve adjustment, I have done 3 in my entire life, 2 on the J35, and one a J30. But My brother in law never did one and I don't think he needs one. I am not sure why these things are the way they are at honda. Maybe its that the tolerances are a bit more loose on some things, and thus there is more variation from engine to engine, car to car. I have seen people have honda's literally fail for no reason, back in the early 2000's my uncle had 4 transmissins replaced under warranty and swore he would never buy a honda again. I have been trouble free.
My toyota experience on the other hand is just that, a toyota expereince. Buy, drive, forget. The fun ones and the boring ones, all perform exactly the same in regards to longevity and maitanance. There are a very small amount that had issues over the years (the early 0w20 2.4L 2AZ's for example, as well as the first year of the 2GR, and some 2GR taco's) but mostly its a don't look under the hood car.
My mother in her old age recently hit a deer at 55mph in her Lexus ES, there was almost no damage to the car. All the impact was taken by a thick piece of foam between the bumper and the crash bar. No air bags, no hood or fender damage. Just cracked up grill. Insane. Literally insane. I would NEVER do that in a honda, I baby my honda's beacuse good luck breaking ONE clip and scouring the entire internet to find it because its some special clip that even the germans wouldn't bother inventing. Honda, like Mazda and Subaru, have that stubborn Japanese mentality in some aspects, where they will do things their way, or no way. Toyota has shown to be very flexible to trying new things, except making a good EV for some reason.