When it comes to updates, I have a very simple policy: If it isn't broken, don't fix it.
Due to this method of waiting for other people to pick out the errors I've managed to avoid several serious problems on Android over the years.
This applies to app updates, which more often than not introduce problems, as well.
Not to mention every update, no matter how small, brings with it the risk that you need to go through the entire process of wiping the device. I rarely have the time for that. (Which is why I'm 2 updates behind on my Note 3)