I disagree on this larger point, that pessimism and optimism come down to individual attitudes and subjective preferences. Whether or not philosophical pessimism is true does not depend on whether or not "it's worth it", but merely on the fact that "everybody struggles, everybody will feel pain". If not for that reality, you would certainly place optimism as the most rational choice, and not a matter of individual preference; subjectivity about the topic is therefore a position of consolation. The placement of this truth outside the realm of subjective acceptance, at the level of a universal aspect of life, renders life perfectly intelligible to rational evaluation. Pessimism (the philosophical/structural variety, not common-sense pessimism) can't be refuted by a retreat to subjectivity when the arguments that favor it are objective. I don't want to derail this thread too much, so I might start up a new one if you're interested in discussing this further.
Many atheists see the problem of suffering as a knock-down blow to the existence of a perfect, all-knowing, infinitely loving God. In countless threads on this forum and others, they will respond to Christian apologists who insist that this world is the best one God could have invented by asking why God decided to invent the world to begin with. If he couldn't make this glorious creation without (to borrow Stephen Fry's example) bone cancer in children, how about just leaving everything as it was and not making such a dubious exchange? It's a common reply to Christian theology about God's motives. I'm curious as to why this same reasoning is never applied to the terrestrial variety of creationism, namely the creation of a new human. Of course, I'd also like to hear an answer to the religious angle, but so far none has been forthcoming.
Everyone will feel pain is a bare fact. Granted this is true.
You said pessimism cannot "be refuted by a retreat to subjectivity when the arguments that favor it are objective". But I saw
one argument and it's just a single bare fact talked about as if it's "a universal aspect" when it's an occasional aspect.
And it's an aspect that comes in degrees. There are
degrees of pain or struggle or suffering, and this is one of the other facts that should not be dismissed.
The "problem of suffering" that many atheists go on about irt an omni-god is actually a problem of evil. Not of suffering. Evil's a problem because it's A DEGREE of suffering from which no good can come. It's not a burning sensation that signals the organism "remove hand now!" It's not a state of melancholy that motivates a grand piece of art. It's not a falling out with a friend that tells you how to relate with others better. Good can come from suffering ("the state of undergoing pain, distress, or hardship" according to my dictionary).
In theism there's a metaphysical reason to expect that there would not be torturous suffering. The primary example of it is that no one returns, more mature or wise, from hell. That, and some lesser (for not being eternal) degrees of grievous suffering, can justifiably cause moral revulsion --
if and only if there were a god.
I don't see a problem with justifying suffering. "Consolation" connotes a fakiness to it, but that's not true. I couldn't create my art without the distress of puzzling about life; wonder feeds it but largely due to the contrast with some occasional dismay. I'm working out the contrasts. Also I can't attain the satisfaction of greater skills without hardship.
Should I have to learn from hardship? Yes, in the absence of a god and given how being a sentient organism just factually is. There's no moral quandary to it whatsoever without some unreal ideal introduced by the human imagination into it.
Even with a god, it's justifiable
inside that story as a test. Where the story breaks down is suffering doesn't always result in something good. Sometimes it's excessive in degree, and if there were a god that could stop that excess then he's vicious to not do so.
It's the fact that suffering comes in degrees that matters. Not just the fact of suffering.
So I'm not convinced philosophical pessimism is true.