I have to admit I upgraded the day "Sierra" was released. For various reasons I felt it wasn't for me.
eg. simple action of on double clicking on a file in a folder failed to open - right click and select which app to use!!. Thinking it was my mouse (Magic mouse 2), I tried two other Bluetooth mice and the problem remained even an old Logitec wired usb mouse was the same.
In the end I downgraded back to El Capitan and all is well. Much happier where I am.
eg. simple action of on double clicking on a file in a folder failed to open - right click and select which app to use!!. Thinking it was my mouse (Magic mouse 2), I tried two other Bluetooth mice and the problem remained even an old Logitec wired usb mouse was the same.
In the end I downgraded back to El Capitan and all is well. Much happier where I am.