Metaphysics as the generally accepted paintbrush handle is not a natural, nor well-formed thingspace cluster, that is correct.
However, while Physics are about the world of causal interactions that we call the territory, there are things like cosmology that heavily rests on belief in the implied invisible w.r.t. the cosmological horizon. There are also things like speculating why the universe has simple mathematical descriptions, how to apply the anthropic principle to multiverses and so on and forth.
All of those I would consider less physics and more maths.
Metaphysics as the generally accepted paintbrush handle is not a natural, nor well-formed thingspace cluster, that is correct.
However, while Physics are about the world of causal interactions that we call the territory, there are things like cosmology that heavily rests on belief in the implied invisible w.r.t. the cosmological horizon. There are also things like speculating why the universe has simple mathematical descriptions, how to apply the anthropic principle to multiverses and so on and forth.
All of those I would consider less physics and more maths.