Thanks for the pilot wave mention, that made for an interesting read: https://www.quantamagazine.org/20160517-pilot-wave-theory-ga...
The thing is, my outlook IS under my control. I would not want that outlook, but I would create it. If you don't have any evidence as to whether the universe is cruel or ultimately wellmeaning, then you yourself can choose what to believe about it.
And the universe is outside of your control. Therefore you should not let it have any impact on your outlook.
Also, wanting a positive outlook is a desire. And desires are suffering. And having a "positive outlook" is pre-judging things, filling up your mind with assumptions. When you should be trying to empty it. But, I'm more of a Taoist than Stoic (although there seems to be fair amount of overlap).