What is extended and what is temporal?
Extension and temporality are pure intuitions. We get them from our experience of the world; or more accurately they are
the forms of our experience.
You are asking of me, e.g., what does it mean to exist? Well, its a pure intuition. There’s nothing more I can say; nor can you.
What metaphors/analogies do you use and do you understand their limitations and errors?
Until you are absolutely clear on this we will not make head way.
We might be able to say some things about how space and time
behave scientifically; but not
what they are themselves. Space and time are the
a priori intuitions of the sensory data (manifold) of our outer and (some of our) inner senses; and there may be a space and time akin to these
a priori modes of intuition which may or may not behave similarly (e.g., Einstein’s special relativity). Our brain represents things which occur in a multiplicity as in space (whether that be material [e.g., my hand] or immaterial [e.g., the feeling of pain in my hand]); and it represents things which change in time (which may or may not include space—e.g., thinking). It is impossible for me to speak of anything without referencing spatiality and temporality because they are pure intuitions
a priori in our brains—viz., they are so integral to the human understanding—but it is important to distinguish space and time proper (in the sense of the forms of the understanding) from
conceptual space and time: the latter can be used to talk
analogically about things which may not be in the former (e.g., Platonic forms, God, a non-spatiotemporal “particle”, etc.).
Outside is spatialized language which I don't choose to indulge in so I don't understand what you mean. Use different language. I don't accept it.
You literally cannot describe space and time without using them in language. That’s a waste of time to try and avoid.
Second, you keep using this substance metaphor to reify the notion of properties or talk about them if you don't know.
Is reification always good in your eyes and proper philosophical method?
What “substance metaphor”???
Third, going off of moorean intuition. . . everything I've ever experienced and said was ever a 'single piece' or a 'whole' has always been itself composed. I have never in fact met with an un-composed entity and therefore perhaps the notion of an 'un-composed' entity is itself a limiting abstraction that is therefore unreal and un-warranted to postulate.
That’s called in inductive case against an absolutely simple being; and it holds no weight against the argument from composition because it demonstrates the need for its existence. Your argument only works as a probabilistic-style argument IF we have no good reasons to believe a simple being exists. All you are saying is “well, we haven’t had any good reasons to believe there are black swans, so we shouldn’t”. Ok. But now we know there are black swans….
If you say something along the lines of, ". . . but I can imagine. . ." Then you need to justify the method or role of imagination in proper philosophical practice.
Did you read the OP? It is not an argument from conceivability. I will outline a shorter version here:
A5-1. A composed being is contingent on its parts to exist.
A5-2. Therefore, a composed being cannot exist by itself or from itself.
A5-3. Therefore, a part which is a composed being cannot exist by itself or from itself.
A5-4. An infinite series of composition, let’s call it set C, of a composed being would be an infinite series of beings which cannot exist by themselves or from themselves.
A5-5. In order for a composed being to exist, it must be grounded in something capable of existing itself.
A5-6. C has no such member as described in A5-5.
A5-7. Therefore, the existence, ceteris paribus, of C is (actually) impossible.
Here’s the other version:
1. A composite gets its composition from its parts.
2. If all the parts of a composite are themselves composite, then all the parts get their composition from their respective parts.
3. If all of the parts get their composition from their respective parts, then every member, or part, is lacking in terms of its composition and requires another (or others) that it gets its composition from.
4. If every member, or part, is lacking in terms of its composition and requires another for its composition, then no member has composition.
5. If none of the parts have composition, then none of the parts can give composition to another.
6. If none of the parts can give composition to another, then no parts can be parts of a greater composition.
7. Therefore, if all parts are composite, and a composition depends only on its parts, then there can be no composition.
Instead of bringing up red herrings and straw mans, maybe try actually contending with the above arguments?