The comfort zone for atheists would be increased if it is certain that there is nothing, no feature, outside the observable universe.
A long time ago in a galaxy far, far away I decided to live an evidence based life, which means that feelings, desires, wishes, wants and comfort zones would no longer play a major role in any decision I made and my 'beliefs' would be based on evidence. After decades of evaluation I determined there is no evidence for god. If that changes, I will believe. It is really THAT simple for me.
Why do theists so often transfer their own irrational, emotional, reactionary feelings, thoughts and beliefs onto atheists? We do not think like you; I'm not an entrenched atheist with my angry fist in the air at god who is hoping she is dead or gone and that my atheism can be proven 'right' as if it were some religion. All I care about is the evidence, and I would surmise that most atheists are like that.