Phenomenalism (whether solipsistic or multi-person) doesn’t explain where phenomena come from or why they have their specific forms. If you can form a causal model of how the thing which experiences appearances is induced to have those experiences, you may as well do so. From an ontological perspective, you could say it’s phenomenalism which stops short of providing an explanation.
If you want to integrate the phenomenal into your ontology, is there any reason you’ve stopped short of phenomenalism ?
EDIT: Not sarcasm—quite serious.
(Phenomenalism defined.)
Phenomenalism (whether solipsistic or multi-person) doesn’t explain where phenomena come from or why they have their specific forms. If you can form a causal model of how the thing which experiences appearances is induced to have those experiences, you may as well do so. From an ontological perspective, you could say it’s phenomenalism which stops short of providing an explanation.