If you have precious saved app data or game scores or anything you can't afford to lose, don't install pre-release software. It's that simple. Just wait until the actual updates come out. I don't play games on my phone and all of my music/etc is stored on the SD card so hard resets really don't affect me at all. I don't even use the backup feature because I love a fresh start, every time. I don't even use the upgrade function for new Windows versions on my PCs... the upgraded OS will never be as clean and efficient as a fresh install.
This sort of thinking comes with experience.
Most users do not realise that software installs of any kind need a planned approach. Arranging to put non critical data on the SD card (i.e. Music, Videos, Pictures etc) is a good way to make sure any problems with updates or fresh installs are kept to a minimum.
Obviously I'm not saying that screw ups can be avoided all the time, but minimising the risk is a mature way to approach it.
I feel a lot of problems are caused by the user's inexperience, even though a lot of 'em say, "I've been doing this for years!!!"
Of course, then it is the fault of WP or MS... Never the user.
Already there are complaints about Cyan... Battery life, phantom taps etc.... Funny how the majority of users of users have not experienced this, and is difficult to reproduce. If these 'bugs' could be repeated time after time, I agree there may be a need for 'fixes'.
Often, I have found that the majority of problems are caused by the idiots in front of the keyboard or touch screen!!
I say, if you want to stay with the DP, be my guest. Hopefully Cyan never makes it's way to you and you are stuck with a 'half' a phone..... May you both be happy!!!!