That's not all — this update also brings modem stability fixes, improved performance and bug fixes, as well as improved handling of external game controllers. (androidauthority.com)
Finally, there are also a number of stability fixes, to address some of the crashes that have been reported. (blog.us.playstation.com)
They were working on 7.0 and switched to 7.1 for stability fixes / enhancements. (sammobile.com)