Continuing the discussion from Align axes with a face and reset axes:
This SketchUp forum (built using the Discourse engine) is quite new, as of this posting. There have been at least 2 previous SketchUp forums, that used other engines. It was not possible to migrate the old historical postings to this new site.
So anyway, don’t be surprised that not much has been posted yet. (In addition, at least 2 of those were posted in the wrong place. Ie, they are not really Developer FRs.)
Also, keep in mind that the FR forum is for Ruby, and the C SDK, and any other programming interface for SketchUp and it’s world.
I am going from history. Because I came from using AutoCAD (for like 30 years,) which always had a UCS feature, the lack of axis exposure is one of the first things I noticed was missing from the SketchUp API.
I came to SketchUp in the initial 7.0 release, specifically to do Ruby API plugins.
I quickly found that the Google Groups sucked, and spent most time at SketchUcation which was running the phpBB forum engine.
So anyway, they are many old posts (at SCF,) where this issue (Axis class in the API,) is asked about and discussed.
Probably the are several Feature Request threads or topics there, and on the old forum Google groups, etc.
It has gotten to the point where I no longer remember all the API bugs and FRs that I or others have filed.
Old forum posts are not the easiest way to look things up.