I think 6 to 7 was really difficult, but everything that shipped with 7 would go up easily to 10. Many people were still repeating the same “my iPhone 4 became slow so planned obsolence” mantra.

iOS 11 on the other hand is just garbage. It doesn’t run like shit only on older devicee, it runs like shit on a brand new iPhone 8 as well. Battery tests were abysmal. I woke up this morning because of an alarm on my iPad that was planned only on weekdays. WTF!! SUNDAY!!!

11.1 solves a lot of problems. Installing dev certs on all of my devices infected with 11 just so I can run the 11.1 beta.