Assuming you are talking about web applications from banks and non-tech Fortune 500 in general, it's because many of them are: * incredibly bloated (and stil

Assuming you are talking about web applications from banks and non-tech Fortune 500 in general, it's because many of them are: * incredibly bloated (and still lack most of the features that an actual human user would want) * poorly coded by armies of outsourced programmers * using over-engineered code built on top of obsolete frameworks * running on a "homologated" stack, which is often 3 to 7 years out-of-date (I know because I was partially responsible for some of them, in my dark past.)