I'm not aware of any federal laws that ensure you can anchor
any place indefinitely. Seems like a dismal existence in any case. Stuck in Sarasota
forever! I'm also unaware of such a thing as "federal anchorages". Areas on the NOAA charts
shown as "anchorages" are not "protected" just designated. Many such areas like designated "barge fleeting" areas would not be a welcome location for dropping the hook either.
There is an increasing number of cities that are regulating anchorages
is very active and has the most number of problems given the shrinking number of places you can anchor
a boat and the increasing number of boats.
There may be places where federal law or state laws allow activities that are being precluded by local ordinances. I doubt your recitation of federal law will be of any interest to any of these people. Just being able to anchor some place fails to address the rest of the problems. It also does not protect you from anything else. You don't escape local laws because you are in an anchorage.
International law permits you safe haven while waiting for appropriate weather
when in transit. That does not provide the ability to stay indefinitely any place. If you have a problem with particular community then you need more help than just a citation of federal law or a quote you found on Cruisers Forum.
Cruisers Forum really isn't a maritime law library. The issues in Florida have been discussed here before and I would not say there is a solution to these problems. Free legal
advice you get on the Internet
is not always worth what you pay for it. Real lawyers know more law than we do. We don't mind not being lawyers.