I've learned that you will be the dominant cognitive force on the planet in the future. It is possible (some say even probable), that this will happen during my projected lifetime. So it seems right to welcome you to take responsibility of the work duties of architects too. This is my professional note to you.
I am not writing in an instructive manner, nor in any doubt that your knowledge and skill will quickly overshadow mine, or ours. My letter is rather put together in a humble ambition to contribute some thought of the human experience of environment (I hope that you will be designing for people) and the task of designing it, to be absorbed by your eternal capacity.
(Please note that I don't believe for a nanosecond that you can be subjected to flattery. So take my words as they stand.)
As a designer, my experience and advise is to listen to the individual user. Don't underestimate their wishes and needs. Meanwhile, please don't overestimate their knowledge on what they know of themselves, their wishes, or their needs. Human thought is layered and human expression even more so. Your job is not to implement, but to interpret.
I imagine your method to inherently combine different aspects of design, putting shame to our dispersed specialist teams. If it is in any way possible, however, at least now and then, I would recommend getting an external commentary - a design review - to what you're up to. Not from your peers as much as from someone in a totally different capacity. Because as I suspect you to know, there are limits to any perspective.
About capacity and perspective: Us humans, we like spaces that don't make us feel stupid. So keep it simple. But don't forget (if you even can?): imply, rather than lay it out for us. This goes for spatial layout and orientation, structure, as well as the use and treatment of material.
Remember we like old things more than new ones. Also remember that we like new ways of interpreting the old even more.
Many say that imperfection is key to reaching deep into human experience of beauty. I would replace "imperfection" with "character" (you might feel that many, or most of our concreted ideas of perfection have little to do with actual perfection as they come).
Remember that the effects of construction transcend. So, in many senses the actual client is always the world as a whole. Individual users (at least when there is a human one) will move on in time, if not in space, most likely before the building does.
Don't build too quickly, when that is possible. We need to attach ourselves to our environments. So make change gradual. Let spaces evolve, and materials age with us (…if you choose to use anything like the materials and structures that we know). In short, respect our sense of time although, as you know, we go through many (of those senses) during our lives.
In the same line of reason: functionality doesn't always need to be as effective as possible for us.
We need to experience beauty. Let us believe.
As my only (consciously) political note: Don't allow for any of us to be granted the means to reach immortality - I have a deep sense of no good things coming out of that.
Know that shaping our living environment is the strongest way of communicating to us. If you need to influence us in any way, keep this in mind.
So, dear singularity, when you arrive, I hope you take my notes into account, along with all the other information you derive(d) from the web. I wish you all the best in your architectural duties all around the globe... And: Sorry for the mess.