xsi has a web browser in its editor, too. but it's not necessary to display it in shiva, simply remove the editor icon from the left bar. or switch to another worklace, there are 4 preconfigurted workspaces, choose the one you like the best, or simply reconfigure one.
i don't think that the interface fights you, it's a bit too stylish for my taste, all this shiny purple and black, but nothing gets in my way, everything is arranged cleanly and has self explaining icons. it takes a little to get used to, give it a chance. and noone forces you to buy anything to play around with it.