But what if the consciousness is just a notion for the systems that reach certain level of complexity, i.e. can solve the same easy problems as human brain can. I mean there is no qualitative difference between programmed robot and us, but only quantitative. So physicalism accepts your objection and go on with programming robot until it can solve Turing Test. Will you accept that the robot is conscious now? Why can’t “first-hand 'experience' of the world and itself” automatically emerge if the system is complex enough and aimed to survive?

Hard problem solving is not required to create consciousness. Humans can’t solve hard problems but they make children conscious meanwhile human children grown by animals become animals.

May be hard problems of consciousness is like describing feeling or summary of all feelings. We can feel but can’t explain. Meanwhile every our feeling has underneath chemical reactions.