My central titanium experience:
At this point I was in Japan. No problem, I thought, as the detective work revealed that the frame was manufactured in Japan. At a local optician in Japan they said that nobody is going to touch it. I have to send the frame to the US to my optician. Then the optician will send it to the manufacturer in Japan for repair. Then they will send it back to my optician in the US and he will send it back to me in Japan
That is just Japan. I went to Sony with my 3 day old and broken Sony phone... They flat out refused to repair it even if I paid. I also have a Japanese Onkyo phone that I can't reboot because it might not ever turn back on. The shop where I bought it doesn't want to hear about it. That's Japan, home of the best and wosrt customer service.
The issue is that every company has deals with repair shops, didn't buy in Japan then nobody is getting a kickback so you are screwed.