You are assuming that nothing at all whatsoever was broken on the site. This is incorrect. For example, the reporting system did not work before. I just thought that members here never reported anything, and every member probably thought that site staff simply ignore reports. But now I've seen & addressed several reported posts/messages in a couple days. What does that have to do with site navigation? No idea, but I know enough about computer code to know that it does strange and mysterious things when you fiddle with the 1's and 0's.
Anyway, its no secret that content navigation in general has been mediocre at best here. And yes, the site update made it worse. My guess is that the lack of 'depth' to the author page is a fixable bug (vs a new permanent feature). I know extremely little about the nuts and bolts of the site, so please don't take that as anything other than a guess.
If you want to find stories (or other content) from a member, use the search. I just checked the advanced search with Curt Bruch & found his 200 most recent stories (that's the max result limit). If I include a keyword, like 'journal', its down to 103 results. And with the 'title only' tickbox checked, I end up with his entire Journal of a Journey series with nothing else mixed in (including comments). So no, its not impossible to find things.
Admin is working on things. Remeber: they didn't do this to piss you off. So maybe give them a little slack as they deal with the unintended consequences of fiddling with the 1's and 0's.