No, actually, you don't.
That's the thing that people who haven't actually used webOS devices don't "get." You do not have what webOS gives you.
In attempting to use android devices over the last few months, I become more and more frustrated at the UI. I'm in a news app, it links out to a web page and I'm in a browser and there's -no way- to get back to the news app without closing the browser. It's running on a computer platform more powerful than my desktop was just a few years ago, and it can't have multiple windows open at the same time? Bah. Humbug.
WebOS provides a seamless user interface. Android and IOS both are cut up into little pieces. It's very frustrating to be in a twitter app, and have a message come in, and a phone call, and no way to select which app I want to go back to, even if the OS didn't put the apps not on screen on hold instead of letting them continue to run in the background.
On webos, I can have a video running in a minimized card while I have a phone call going on, while I have a twiiter app updating, and flip between them easily. Now, I know that the average user isn't going to have the 10 or 12 windows I leave open on my Palm Pre + all the time, but the people I know who own them who are NOT geeks love the UI and mutter and mumble angrily when they're confined to android and Ios phones.
HP has a lot of work to do to get that fact into the publics mind, but webOS is by far the most USABLE portable operating system in the world. Is it somewhat short of apps as of today? Yep. Is it worth the effort? Yep.