I guess my feeling on that is the author is identified by the blog, which is shown. Click on that link and you get access to all that you mention.
By bylining the blog it draws attention to that rather than the individual, and we want people to visit and read the blogs primarily. Once there, they can then go do all the author related stuff, no?
As for the slowdown, Dani and Blud have been informed and are breaking into their semi-vacation thing to look at the issue. Trouble is it seems to be one of those impacting upon some people some of the time things, so hard to track down :-(
The member's name and a link to their profile has always been in the sidebar under the "username in a nutshell" area where "username" is hyperlinked to their profile. As Davey suggested, it's always been there but it's also always been classified more as extraneous information with the user's actual blog, that the entry belongs to, being the primary way of classifying the blog entry.