I agree they will never admit a problem. But I do think they will come up with a fix because this will affect their bottom line. If people stop buying games because of this issue, Apple will quickly move to fix. Apple makes more money selling apps and in apps sales, then they will ever make just off the phone. Losing money is the fastest way to get a company to fix a problem.
If I'm correct, the iphone 4s had this also, and no fix. Why would Apple fix it now if they didn't fix it then ? They must have known of the issue for the iphone 5s and decided to ignore it. Just my guess. I have a friend that has a check smartphone (unknown manufacture) and I tried his on a kitchen table, not very level and it read "0"...Go figure.