A lie by omission. They forgot to warn (following their warnings upside down):<p>1. Website can be malicious, too. Phishing, clickjacking, XSRFs, browser exploits - there's a lot of nonpleasant stuff on the web.<p>2. Websites can't manage memory and other resources at all. Sure, you, for example, can try to measure performance and disable UI effects, but that's another story.<p>3. In a same way, users must have enough of free space where browser's application cache is kept, too. Or you'll strain network re-downloading same data over and over again. This is especially annoying for roaming and other areas with high $/MiB cost or countryside with slow GPRS connectivity.<p>4. Website can fail, too. And if this is not some user-local network problems, this is more disasterous than a crash of a single copy of app on someone's device - your "webapp" works for noone at that time.<p>5. And, obviously, in a same way as removing the app, users could delete the bookmark for your service.