Don't get me wrong here. I love my country but hot damn do I hate our government. HK or UK or Canadian passport would probably be nearly as good but without any of the bullshit.
So turns out you don't know what this is about. It's not about the century-old citizenship-based taxation, it's about the additional legal and bureaucratic overhead of FATCA on both the citizen and the structures around them e.g. non-US banks refusing to deal with US citizens because they don't want to deal with the legal and financial risk of FATCA.
But I do have to spent the time and money to have someone to fill out the forms.
I also have to worry that my bank might decide to cut me off, because they also have to "fill out forms", that is they also have "expensive reporting requirements". Even if you paid no taxes and had no problems with the tax treaty, you still might not be able to get a bank account in Singapore.
Yes, there are a lot of people who also don't like the taxes. It's an important point. But not the primary point, which is the expensive reporting requirements for both American citizens and banks which do business in the US and which have American citizens as clients.
https://www.linkedin.com/pulse/top-10-most-powerful-passport...
In addition to the additional metrics you mentioned, perhaps yet another to take into account is how hostile natives feel towards you when traveling in certain parts of the world--up to and including harassment, kidnapping, and (in limited locations) beheading risks.
In places (even here in Europe) where people tend to by default assume good English speakers to be American, I get better treatment by managing to convey that I'm not.
Any other bits?