I'm still getting issues with some of my applications on the latest update, and I'm sure I will face more with iOS 15. I saw today's presentation about the new iOS, and I think it's having a lot of improvement. I hope that most of the issues regarding battery will be solved fast as I'm planning to create my own application soon, and I wouldn't like for people to complain thinking that my application drains the battery off! I am developing my app with
cubycode.com, and when I mentioned the specifications and the bad publicity from such occurrences, they were more than happy to assist me and back-test everything to make sure it will not be an issue!