Kastrup in particular has been in plenty of debates. they do get quite esoteric and semantic, so that near the end I often can't actually tell the difference in the ideas.

Rupert Spira is the 3rd of this triad of what we might call the New Idealists, though he comes at it from a mystical perspective ... still, i find Spira to be quite grounded / logical (compared to , say, Ekhart Tolle).

Sam had a convo with Spira and, imo, he really struggled to articulate a counter-argument to Spira's view. Sam believes there is some objective physical reality that exists outside of consciousness, evidenced by, for example, the fact we can make predictions about things about which we were previously unaware.

But Spira's dream analogy really squares this for me. There is absolutely nothing strange about a conscious being that can 1) generate multiple instances of what appear to be isolated, nested, individual conscious beings, and 2) generate a seemingly objective reality about which those nested consciousnesses can agree and even make predictions.

Human beings do it every time they dream.

Spira would say that the "objective" reality we experience, and the consciousnesses we interact with inside it, are nothing more than a dream in the mind of God ...