Willy, hopefully most intelligent people who discuss the simulation argument are clear that it cannot be right. There are a few people who think otherwise but that is a different game. Despite this, the simulation argument is very worthy of discussion and analysis. You see the argument begins with some philosophical assumptions, (not all of them explicitly stated) and proceeds to deduce that we must live in a simulation. Since the conclusion is preposterous you can then look at the assumptions and consider which ones may be wrong and what that tells us about reality at a philosophical reality.
What I have done is taken the simulation argument as a test of my philosophical world view. If my view included all the assumptions that led to the conclusion that we are in a simulation then I would rethink my ideas. The point I make in my essay is that the conclusion is avoided.
There seem to be some people who don't understand the point of arguments like the simulation argument. They think that people who discuss it must believe that it might be true. They then provide reasons why it is ridiculous to think we are in a simulation and conclude that everyone else is dumb not to see that. In doing so they completely miss the point of this type of philosophical thought experiment which is really about analyzing assumptions.
Your second argument is another good example of this. It is closely related to the infamous Boltzmann's Brain argument. It question why we have to go through the long process of evolution to exist when in an infinite quantum universe intelligence should eventually appear many times just by random chance. In your terms, why can't we just wait for randomly typing monkeys to produce the goods?
Again many people don't understand why this is worth thinking about because it is obviously an absurd idea. Actually it is the fact that it is absurd that makes it worth thinking about as a way to test assumptions. I don't claim to have all the answers for this.
On the question of intelligence, I am talking about what you call intrinsic intelligence, but you are right that this could be opened up to a wider definition.