What does the length of the answer have to do with how hard a problem is? The answer to P=NP can fit in 1 bit, but that's still a hard problem, I assume you agree?
Perhaps by "answer" you also mean to include all the the justifications necessarily to show that the answer is correct. If so, I don't think we can fit the justification to an actual answers to a hard philosophical problem on one page or less. Actually I don't think we know how to justify a philosophical answer (in the way that we might justify P!=NP by giving a mathematical proof), so the best we can do is very slowly gain confidence in an idea, by continuously trying (and failing) to poke holes in it or trying (and failing) to find better solutions.
In a PM you imply that you've found the true answers to 'free will', 'does a tree fall in the forest', 'the nature of truth'. I'll grant you 'does a tree fall in the forest' (since your solution appears to be the standard answer in philosophy, although note how it says the problem is "untypically simple"). However I have strong reservations about 'free will' and 'the nature of truth' from both the inside-view perspective and (more relevant to the current post) the outside-view perspective. Given the history of philosophy and the outside view, I don't see how you can be as confident about your ideas as you appear to be. Do you think the outside view is inapplicable here, or that I'm using it wrong?
Well, given what you seem to believe, you must either be more impressed with the alleged unsolvability of the problems than I am (implying that you think I would need more of a hero license than I think I would need to possess), or we agree about the problems being ultimately simple but you think it's unreasonable to try to solve some ultimately simple problems with the fate of the world at stake. So it sounds like it's mostly the former fork; but possibly with a side order of you thinking that it's invalid for me to shrug and go 'Meh' at the fact that so...
On the subject of how an FAI team can avoid accidentally creating a UFAI, Carl Shulman wrote:
In the history of philosophy, there have been many steps in the right direction, but virtually no significant problems have been fully solved, such that philosophers can agree that some proposed idea can be the last words on a given subject. An FAI design involves making many explicit or implicit philosophical assumptions, many of which may then become fixed forever as governing principles for a new reality. They'll end up being last words on their subjects, whether we like it or not. Given the history of philosophy and applying the outside view, how can an FAI team possibly reach "very high standards of proof" regarding the safety of a design? But if we can foresee that they can't, then what is the point of aiming for that predictable outcome now?
Until recently I haven't paid a lot of attention to the discussions here about inside view vs outside view, because the discussions have tended to focus on the applicability of these views to the problem of predicting intelligence explosion. It seemed obvious to me that outside views can't possibly rule out intelligence explosion scenarios, and even a small probability of a future intelligence explosion would justify a much higher than current level of investment in preparing for that possibility. But given that the inside vs outside view debate may also be relevant to the "FAI Endgame", I read up on Eliezer and Luke's most recent writings on the subject... and found them to be unobjectionable. Here's Eliezer:
Does anyone want to argue that Eliezer's criteria for using the outside view are wrong, or don't apply here?
And Luke:
These ideas seem harder to apply, so I'll ask for readers' help. What reference classes should we use here, in addition to past attempts to solve philosophical problems? What inside view adjustments could a future FAI team make, such that they might justifiably overcome (the most obvious-to-me) outside view's conclusion that they're very unlikely to be in the possession of complete and fully correct solutions to a diverse range of philosophical problems?