Anon 1: I didn’t forget that Germany’s states are personified. An example post is not purposed to provide
a full list of every case in the manga/ web comic. That’s why I provided
sources for people to search the “states and provinces” tag if they wanted a
more complete list of all state personifications.

However, since we’re on
that note, if anyone wants examples of German state personifications, several of
them are mentioned in the “Cleaning Prussia-san” game [x]. Saxony makes a few
formal appearances in the webcomic (e.g., one panel in the Maria Theresa Arc).

Hesse is the one with
the most formal appearances (e.g, 2011 Christmas strips, volume 5).

Lastly, since the states
aren’t actually personified in canon, that last part of your ask is a headcanon
(I just don’t want anyone to confuse this). But, yes, I’m often perplexed by
the whole ‘top secret’ trope. This is also the case for me in AUs where the nations
are kept as a secret from the public, when we know in canon that humans are aware of their existence.

Anon 2: I suppose, but there are
times where they are both referred to as Italy in conjunction. It’s an inconsistency I’ve noticed in the series.

Like you said, Romano is
referred to as Italy in Lithuania’s outsourcing pt. 3.

However, they’re both
seen representing Italy [in general] at a world meeting in an incompleted strip. (not canon,
just used for demonstrative purposes). 

Likewise, what I find
odd is that when they’re given EU profiles, Veneziano is referred to as Italy,
meanwhile Romano is specified as South Italy. [x]

 Either way, there’s no
real reason provided in canon to account for this, so I just accept it how it
is.