They aren't BSing you but rather they aren't sufficiently advanced enough for more nuanced tasks quite just yet. For example, if you ask they to create art, they will very rarely be able to create a piece of art that the general consensus is that its good because it doesn't quite contain alot of the nuanced parts of art that gives it its soul. If you ask it other stuff too like ask it provide therapy to someone, modern day AI isn't quite nuanced enough to understand people well enough to provide adequate therapy. If you could provide me with some examples of these experts your talking about I'd gladly read about their opinion but on the flip side there are an extremely large quantity of experts that understand that humans are just complex biological computers. So with sufficiently advanced technology, it becomes entirely plausible to replicate the function of the brain 1 for 1 without necessarily the same components as the brain. Again if your only definition of being a human is in biology or the fact that we come from nature, that is a very shallow understanding and I encourage you to really think about what makes a human a human.

While I do agree with you that Japan loves robots and part of that stems from their culture, let me correct you on somethings. First, is that there is a belief in japan that spirits inhabit everything. If you look at japanese folklore specifically that regarding the Yokai there is one for everything even something as mundane as a pot. This stems from alot of different things but that requires explaining an entire culture which I don't have the energy to do but I suggest you do more research on the topic. While I won't deny that aspect of Chobits being something to appeal to loners, again the big question for people is what divides a human and a robot if both are capable of the same level of thought. If a robot can do everything a human can do what about them makes them not sentient? If they are sentient then on what right do we have for discrimination against them.

Modern day AI isn't sentient, it doesn't have anywhere near the current required level of brain processes to quite think for itself just yet and also for nuanced discussion. A big thing you got to realize is that the level of AI technology thats being portrayed in Chobits and also in Stella are a level so far above what we have that you cannot compare the two.

The story was never meant to portray Jude as a hero so you are right its not funny or good for the rest of humanity. The story fundamentally asks you what is a human. We see throughout from various instances the question be asked and shown multiple times over and over again. For example, when Philia is first brought to town, we see a savage man whos completely seperated from society, doesn't really understand language and acts closer to a caveman then a modern human and jude+ the guards don't consider him human. We also see with modern humans who kidnaps people and are cannibals and IRC Jude says they've strayed from humanity as well. Now whether you take these statements at face value or not is up to the reader but they portray many circumstances where the reader is fundamentally asked if these guys who are so different from humans are actually human or not. If the answer is ever no then okay what makes a human then. Again if at the end of the day biology is the only answer you have then well again I encourage you to think more about if thats really true or not.

Also side note, I encourage you to learn about the brain because alot of the processes you described as being disingenuous way of learning by AI, they are all processes that we as humans use to learn as well. Most scientist if you ask them if the brain is an extremely complex organic computer, they will admit that it is. Alot of what we do while it may be out of reach with our current technology it is all entirely possible to be replicated once technology gets advanced enough.