Firstly I am not sure how you can compare a J IB experience with an LH F experience as again you are comparing apples with oranges.
Here I am comparing LA/IB C class vs LH/SK C class. The following example compares F vs F. So no apples with oranges thing.
In my experience especially on QF/BA/CX connections, I have not usually had an issue with a misconnect, nor have I had that many issues with IB although I will agree with you that the ground experience with IB is it's weakest point. I suspect if you misconnect with a carrier like MS you would have a similar experience if not worse.
Asian operations on both alliances have no issues, only *A has better overall coverage in the region.
I will however agree that *A in some areas in respect to service and ticketing does consequently feel a little more integrated.
It is more integrated, an area which OW has to work hard to catch up. In the end this is one of the most important points of an alliance (especially when irrops appear).
The car experience is good, but I don't feel it makes the lounges the best and again I should remind you that the LH HON lounge in only available for LH/LX/OS pax flying in F or HONs. A UA 1K flying in F on UA out of FRA won't have access to the lounge.
As mentioned in my post, I fly LH from South America to EU. AFAIK UA doesn't fly this route. But if you have a UA F BP, you are welcomed at the FCL, which is better than BA's T5 FCL.
As Sagy has been an Emerald for 5 minutes, I don't think we can really compare your experience to his.
Talking about arrogance?
Go and speak to your congressman then and complain as it is largely the Americans who have so far said no to AA/BA ATI (I am of course assuming your an American based in Japan so if this is not correct, ignore this paragraph). Sadly as I am not an American citizen, I don't really think they would be terribly interested in listening to what I had to say about the issue.
Seems you assume too many things. I don't know how you assume I am American. Shouldn't OW management and lawyers try to solve this issue?