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.
Is the social-good argument your true rejection, here?
Does it follow from this that if you concluded, after careful analysis, that you sitting stationary in a corner of a room experiencing various desirable experiences would be a net positive to the rest of society (your friends will be happy for you, you'll consume fewer net resources than if you were moving around, eating food, burning fossil fuels to get places, etc., etc.), then you would reluctantly choose to wirehead, and endorse others for whom the same were true to do so?
Or is the social good argument just a soldier here?
After some thought, I believe that the social good argument, if it somehow came out the other way, would in fact move me to reluctantly change my mind. (Your example arguments didn't do the trick, though-- to get my brain to imagine an argument that would move me, I had to imagine a world where my continued interaction with other humans in fact harms them in ways I cannot do something to avoid; something like I'm an evil person, don't wish to be evil, but it's not possible to cease being evil are all true.) I'd still at least want a minecraft version of wireheading and not a drugged out version, I think.