Not sure if you’re still looking re: the forum, but:
AFAIK there’s no way to reverse the comment ordering.
If you’re logged in, it should take you to the latest unread post in each thread, so you probably don’t need it.
Alternatively, on desktop, each thread has a ‘timeline slider’ on the right. If you click on the number at the top it’ll take you to the very first post. If you click on the number on the bottom it’ll take you to the very newest post.
Similarly, on the forum homepage ‘Categories’ view, if you click on the thread title (while signed in) it’ll take you to the first unread post, but if you click on the little gray ‘time/date’ it’ll take you to the latest post.
Generally, being logged in makes the forum work much more smoothly.