iOS 15 from release date has had the most bugs I've ever experienced with any former versions of iOS. Siri would revert back to Dragon style text to speech randomly is one thing I noticed frequently.
A former Apple person reminded me
that the new major version iOS must ship on the same day as the new hardware, as the new hardware (this year, the new iPad Mini, and iPhones 13) will not run iOS14. They are developed in lockstep with the next OS and will ship with it, and cannot ship without it.
The software is going out the door alongside the latest version of their biggest money-making product.
