I am a total optimist.
My wife is a total pessimist.
We tend to have issues because of this at times.
I see myself as the happier of the two of us and I attribute that to my positive attitude.
If you go around all the time expecting the worst, I believe that is what you will get.
I think I would agree with the premise, but I don't know how possible it is to over look some problems, and just expect if you don't pay any attention to them, they will just go away.
Some relationship issues may be beyond that philosophy.