It is complete madness that an upgrade taking 4 hours plus has not been implemented and checked for possible problems on a test bed first.
The most important aspect of any system / application is to have a back up version that works, and any upgrade should be tested on that first, before going live.
Can u imagine if this was a payroll application that was upgraded and went live with glitches everywhere. The IT department would be fired en bloc without hesitation.
As for the hybrid why introduce such a club if one can't replace the 3 iron with it as so many of us do in real life. The new Titleist irons in my Pro shop only go to a 4 iron.