You don't HAVE to use this new system... You are welcome to keep doing it THIS way, but it would just be nice to keep all blogs together =/
the way this new one works is a bit better too, in the way you commend on entries. It prevents your blog from being spammed up etc.
It doesn't take that long to copy all your content accross.
It took me just a couple minutes...
Open two tabs, one with your current blog, and one with the new section open.
Create Entry > Copy old blog post > Paste.
Create Entry > Copy old blog post > Paste.
Create Entry > Copy old blog post > Paste.
Create Entry > Copy old blog post > Paste.
Done.