Note: This forum is not affiliated with World Sailing and comments on this forum do not represent an official interpretation of the rules, definitions, cases or regulations. The only official interpretations are those of World Sailing.
Here is a small document illustrating the changes in RRS 2025-28 for young sailors along with some tips on the common rules and a guide to protest. The same document may be accessed at the following link
Sail the Course now includes "(c) she finishes", so finishing is inside STC and therefore Proper Course does not change in regards to finishing.
You might want to reword this comment on the change in 17. I found it a little confusing.