I have found that the people who keep pushing optimism are those who are already successful. It is not that being optimistic leads to success but that successful people are more inclined to feel optimistic.
“Everything is awesome,” in this context, is alienating, or if you prefer, gaslighting.
And self damaging. Nobody wants to talk to them about real problems because there is no safe space for candor. So people talk to the pessimists, creating a rift. “I haven’t heard anything about this,” has been uttered more than a couple times. No shit Sherlock. Who would talk to you about problems like this?
Pessimists I have seen generally as more secure from planning for the worst perhaps to overkill extents but less happy.
The snarky summary is "An optimist is a million dollars in debt, losing money every day and thinks it will get better. A pessimist will eventually have a million dollars, feel precariously worried about pending disaster while their true greatest risk is their urge to commit suicide."
How do you know the casual relationship?
I can imagine if all you have is positive feed back loop, you will see everything will just keep improving endlessly.
Which is why these perspectives are what they are perspectives. They are not real world models you should live your life by.
In real life you must deal with the situations as they are.