It may seem strange that I keep hammering-away at a metaphysics that regards Beings as the fundamental 'unit' of reality; but this comes at the end of some decades of trying to make the available, conventional metaphysical assertions 'work' in my life, in 'real life'.
All the mainstream systems of metaphysics since the ancient Greeks invented the subject, have been abstract: that is, they posit some real-reality behind this world, of which there are no assume-able examples in this world we inhabit.
And there is never a way by which we can confidently map the abstract metaphysical schema onto the minutiae of this-world - or interpret the specifics this world in terms of exact aspects of the metaphysics.
For me this has, in the end, always proved to be a fatal problem. Sooner or later; I have had to discard all such theories.
For example, Plato's theory of eternal, timeless ideas behind the mutable actualities of this world. We can discuss these ideals with parable-like worked examples (as Plato does), but cannot point to any actual ideal that for-sure explains any specific thing in this world - because the relationship between the ideal and worldly is not knowable within the metaphysical system. Indeed, a qualitative difference between this temporal world and the eternal-real-ideal, is the basis of the metaphysics.
More clearly, the forms of Aristotle - that were adopted by Aquinas - are abstractions that explain what we observe in this world - but what is a "for sure" example of a form? How can I tell what is the form at work in any particular instance of this world?
A more recent example derived from Aristotle is Rupert Sheldrake's adaptation of these Aristotelian forms as Morphogenetic Fields - which exist and act everywhere. These can be posited as explanations, but cannot be known directly. We cannot observe a morphogenetic field, nor say which exist or how many exist, nor describe and discuss the nature and scope of a specific morphogenetic field.
A further abstract entity I engaged-with was Systems, as found in Luhmann's Systems Theory - Indeed, I got very deep into this form of explanation, and published quite a lot of work under its influence.
Yet the Systems of Systems Theory are abstractions. It is not possible (not possible within the realm of Systems Theory) to know whether some phenomenon in this world is, or is not, A System. Indeed, it is part of Systems theory that knowledge is only possible within Systems - so one System can only infer another. And even within Systems, a knowing sub-System can only infer about the System as a whole, based upon finite sampling and finite complexity of processing.
Nor can we identify what are the real abstract Systems - we cannot count them, nor classify them - their reality is wholly hypothetical.
Thus when I attempted to explain any particular thing in terms of Systems Theory, I could only guess at what System or Systems - or no System at all! - were involved in this phenomenon.
In other words; as is usual with abstract metaphysics, we cannot map abstractions onto everyday reality, nor can we discover what specific everyday instances are instances of particular abstractions - whether ideal/ form or morphogenetic field. And these 'cannot's - these limitations - are fundamental to the metaphysics themselves.
In other words; the metaphysical theory itself includes among assumptions that its relationship to this world cannot be known.
The great advantage I find about a metaphysics based on beings, is that while I do not know all Beings nor all about Beings; I do know the identity several Beings for sure: starting with Myself!
I am sure that I am a Being - and (almost) equally sure that several members of my family are Beings. So there is a real world and direct mapping of metaphysics onto reality - that cannot be matched by any abstract metaphysical System.
For me this ability to map the theory onto experienced-reality is a very powerful, indeed decisive, difference between positing systems like those of Plato/ Aristotle/ Aquinas/ Sheldrake/ Luhmann - and what I am doing with the metaphysics of Beings.