I can conceive of the following 3 main types of meaning we can pursue in life.
1. Exploring existing complexity: the natural complexity of the universe, or complexities that others created for us to explore.
2. Creating new complexity for others and ourselves to explore.
3. Hedonic pleasure: more or less direct stimulation of our pleasure centers, with wire-heading as the ultimate form.
What I'm observing in the various FAI debates is a tendency of people to shy away from wire-heading as something the FAI should do. This reluctance is generally not substantiated or clarified with anything other than "clearly, this isn't what we want". This is not, however, clear to me at all.
The utility we get from exploration and creation is an enjoyable mental process that comes with these activities. Once an FAI can rewire our brains at will, we do not need to perform actual exploration or creation to experience this enjoyment. Instead, the enjoyment we get from exploration and creation becomes just another form of pleasure that can be stimulated directly.
If you are a utilitarian, and you believe in shut-up-and-multiply, then the correct thing for the FAI to do is to use up all available resources so as to maximize the number of beings, and then induce a state of permanent and ultimate enjoyment in every one of them. This enjoyment could be of any type - it could be explorative or creative or hedonic enjoyment as we know it. The most energy efficient way to create any kind of enjoyment, however, is to stimulate the brain-equivalent directly. Therefore, the greatest utility will be achieved by wire-heading. Everything else falls short of that.
What I don't quite understand is why everyone thinks that this would be such a horrible outcome. As far as I can tell, these seem to be cached emotions that are suitable for our world, but not for the world of FAI. In our world, we truly do need to constantly explore and create, or else we will suffer the consequences of not mastering our environment. In a world where FAI exists, there is no longer a point, nor even a possibility, of mastering our environment. The FAI masters our environment for us, and there is no longer a reason to avoid hedonic pleasure. It is no longer a trap.
Since the FAI can sustain us in safety until the universe goes poof, there is no reason for everyone not to experience ultimate enjoyment in the meanwhile. In fact, I can hardly tell this apart from the concept of a Christian Heaven, which appears to be a place where Christians very much want to get.
If you don't want to be "reduced" to an eternal state of bliss, that's tough luck. The alternative would be for the FAI to create an environment for you to play in, consuming precious resources that could sustain more creatures in a permanently blissful state. But don't worry; you won't need to feel bad for long. The FAI can simply modify your preferences so you want an eternally blissful state.
Welcome to Heaven.
I don't believe this, but I was concerned I would be interpreted this way.
I can have a subjective desire that a cup be objectively filled. I fill it with water, and my desire is objectively satisfied.
The problem I'm describing is that filling the cup is a terminal value with no objective value. I'm not going to drink it, I'm not going to admire how beautiful it is, I just want it filled because that is my desire.
I think that's useless. Since all the "goodness" is in my subjective preference, I might as well desire that an imaginary cup be filled, or write a story in which an imaginary cup is filled. (You may have trouble relating to filling a cup for no reason being a terminal value, but it is a good example because terminal values are equally objectively useless.)
But let's consider the example of saving a person from drowning. I understand that the typical preference is to actually save a person from drowning. However, my point is that if I am forced to acknowledge that there is no objective value in saving the person from drowning, then I must admit that my preference to save a person from drowning-actually is no better than a preference to save a person from drowning-virtually. It happens that I have the former preference, but I'm afraid it is incoherent.
Caring about what's right might be as arbitrary (in some objective sense) as caring about what's prime, but we do actually happen to care about what's right.