I think there's quite a few features / functionality from the old forum that have ported over but are implemented in a different way and people (myself included) just don't know the new way of doing things.
For instance, the reply button instead of a single quote; bold thread titles etc.
Actually, the bold thread titles for threads with new posts is a bit of an issue at the moment because technically all the threads are new, so all the titles are bold, making it all quite hard to read but this should sort itself out over time.
I'm having a bit of an issue with the quick reply box. After every keystroke all of the text on the page goes from light to regular (or 100 weight to 300) it makes it look like it's flashing and could probably induce a seizure if you were susceptible to it.
This is in Safari 10.0.2 on OSX 10.12.2