Sorry to revive an old thread, but I'm the person who maintains the site and just saw this thread, hopefully I can answer some of your questions.
Privacy Restrictions
There are 2 main privacy restrictions on the site.
10 people taking a subject - obviously for privacy reasons this stops marks...
Agree with this point
Personally I like raw mark numbers as most people have a pretty good idea as to what range of marks they will achieve in the hsc exam (from part papers etc.), so you can get a pretty good estimate as to what your scaled mark will be
Yeah, its not great but most subjects don't scale as well as people perceive them to. Although SOR 2u seems to fare better, I have obtained more graphs from the same site
SOR I vs SOR II vs physics in 2021
Similar result in 2020
However, we can see a bit of variation in how SOR I is scaled...
Scaling for business studies seems to be fairly linear, yuo can have a look at the graph I generated using a website (https://hscscalinggraphs.au/). Multiply everything by 2 as I'm assuming you would want to count both units.