I do think that MonoBook is better for people with slower connections, but Oasis is still superior. The reason why MB is better for people with slower connections is because it has less stuff it needs to load.
Monobook was harder to view since it was stretched. Pages are the same size. They're just narrower. I visited a wiki in monobook (or monobook-style) recently. I had to turn my head to read a sentence and the paragraphs were just three lines. Narrower reading is a trend that's all around the Internet and has been for years.
There's a history link in the MyTools bar. Including on files. One click. I have no idea what you've got to do to get it in three.