What's wrong with a web browser being just a web browser?
They assume because they are happy relying on a browser and who knows how many webapps to get the job that the whole world is too.
Back in the day when you didn't have support for FTP in Windows (XP), you needed IRC just once to visit some obscure chat room or you downloaded torrents only every once in a while, Opera could be all this for you. No need to download stuff for one-time use.
Gone now though, along with magnificent Dev tools, mouse gestures and tab groups and previews. Had to switch to Firefox (not to say its bad, its quite good, but I liked Opera's experience better).