Ok! I've finally got some screenshots to share.. I forgot to do the epubs unfortunately! I can do that soon, but for now here are some kepub shots.
So, just to reiterate, I realise that these changes are slight. But to me, they affect the entire reading experience; it just looks so different to me. More than that, though, I just don't even understand what the difference is, or what's causing it, and why the change occurred or was necessary.
I've shown comparable screenshots of the same page with Georgia and Malabar as two main examples, and I've also included a couple of GIFs that I hope illustrate the differences.
I'm fully aware that some people will say 'they look exactly the same' but I vehemently disagree
It looks worse on the actual Aura HD to me as well.