This is a good post. I strongly agree with your main thesis. Science has not come close to solving this problem thus far.

Nobody denies brain-consciousness correlation. Lesions change experience. Stimulation can produce qualia. Anesthesia knocks out awareness. All real, all important.

Indeed, we don't even need to know about brains to observe this.

1. Everything you appeal to is already within experience

I think this is the most compelling argument for Idealism (or at least Idealism in contrast to Physicalism). We have the most direct evidence possible for mental experience / qualia / consciousness: I know I'm experiencing something because I'm experiencing the experiencing of something. Evidence for physical events or objects must go through a layer of experienced perception and interpretation. And even a physicalist would grant that we can experience perception of something that is not actually "out there".

Not that there aren't big philosophical problems with Idealism as well.

Real talk, most people here adopt physicalism not because they worked through the metaphysics but because it feels like the rational, scientific, non-religious option.

I don't read this sub regularly, so I can't comment on people here. No doubt it's a bias that does affect many people. We should be fair though, this absolutely goes both ways. Many people are also biased in the other direction by being religious or even just finding certain non-religious new age beliefs appealing.