Technically no. Quite a few people choose not to update. Quite a few are running chinook. Nobody holds a gun to your head and says "update or die".
And the problem wouldn't still be there. My point was, if there is a bug in the update, you will find out by reading what other people have had to say. And they can fix it, and you can update say in a week or two after everything has calmed down.
I haven't updated because I wanted to see if there was a problem with the update. And obviously there is. I do the same thing with my windows machine. I wait to see if there are any issues that might come up with the update then I choose to do it.