I'd think that most materialists would also say that materialism commits one to the existence of a certain kind of stuff, not merely that which exists.
Perhaps. If they want to commit to describing a universe in which, say, telepathy exists as being dualist rather than materialist, it is their business, though I personally fail to see why one would consider telepathy to necessitate dualism any more than, say, electromagnetism.
Again, it is all semantics in the end.
Your version is compatible with dualism and idealism.
Dualism, maybe. Idealism, no. Nothing is compatible with idealism.
Idealism is not compatible with idealism, because idealism is incoherent.
In this very same post, you've claimed that idealism is not empty and pointless, since it makes a specific claim about what sort of stuff exists. I take it that idealism is an ontological position, in which case, we seem to have a contradiction.
That is rather my point. This is part of why idealism is incoherent.
Idealism wishes to be treated as an ontological position. All right. We will. It is a means of putting a name to the substance of the universe, and wants to use the term "consciousness". Oops - that term is already in use, and to say that "the substance of the universe" is equivalent to its established definition is simply not true. Treating idealism as a simple naming convention, it fails because it has tried to co-opt an existing term and rendered it meaningless. It is technically usable, but unnecessarily confusing and results in a need for constant clarification as to which meaning of "consciousness" you are currently using.
But that isn't how idealism is
actually used. Idealists generally assert that there is some sort of mechanical difference between an idealist universe and a materialist one, though they never give any coherent explanation as to how or, indeed, even
why. Idealism as generally used is not just a naming convention, but an actual assertion that the universe somehow
is consciousness, as the term is generally used. This idea is completely worthless and incoherent. And, if there
is an actual mechanical difference formulated, it ceases to be ontology and becomes an actual predictive model - at which point it ceases to compete with materialism in the first place, as well as invariably collapsing due to a lack of support for its claims.
In either form, it fails.
This is not correct. There is nothing incoherent in positing the existence of something undetectable.
Save that existence requires interaction, and interaction mandates that the interaction - and thus the entity - can be detected.
Any entity which fails to interact with another entity cannot be stated to exist.
Any interaction which cannot be detected cannot be stated to happen.
Thus, entities which cannot be detected do not exist.
Well, perhaps the word "concede" was poorly chosen, but my point is merely that you seem to agree with Mouline entirely: the materialist thesis is an empty claim.
I am unsure why you seem to keep missing the part where I state that the rest of his argument is nonsensical. I agree with Moulines on
that specific point; the rest of his statements are
non sequitur incoherent nonsense. To say that I agree with him entirely because I agree with one premise is entirely false.