I'm reviewing USA template and library and for me pen sets there does not make sense. Probably USA users get use to that, but behind all pen arrangement, colours and thickness I don't see any logic. It just there.
To compare it with international version - in international version pens have classification - there are pens for walls, slabs, roofs, sanitary, windows... So I can choose wall cut. And then create another pen set - for detail drawing with different scale - where the same wall cut line will have different thickness. Also since were introduced Building Materials - in international version appeared additional pens for most common materials - for cut lines and cut fills - like masonry, earth, steel, concrete etc. That means I can have on plan 1:50 concrete walls with cut line thickness 0.35 and the same wall in details 1:10 cut 0.7 by changing pen set.
All that is missed in USA template. And also quite bad news - I cannot really use pen sets following logic of international version, because USA library objects all pre-set to use their strange pen sets - if I change their pen set, I need all the time change settings of pens in any object I want to use in the project.
Also what is really really strange - pen thickness is coming from which standard? 0.09, 0.10, 0.12, 0.15, 0.30 and 0.40 mm are not from USA NCS - not even close... I don't know any standard, that set such pen thicknesses.
I mean, seriously, - USA are such a big country and such a mess with ArchiCAD default template. This is not cool.