If this is true, then to me it's a reason not to use web applications. (And I don't, for the most part; I still run KDE 3 on Linux, and use KMail to read email. The only web applications I use routinely are for things like paying bills, where I have no choice but to use the web UI for the bank or credit card company or whatever. And every so often those change and I have to re-learn things for no good reason.)