Because: * Mono-cultures are bad security-wise, it's harder to target multiple platforms with different vulnerabilities then one platform (which is one of the

Because: * Mono-cultures are bad security-wise, it's harder to target multiple platforms with different vulnerabilities then one platform (which is one of the reasons IE had such a bad reputation for a long time) * It prevent people from coding to specific browser bugs/quirks. When there are a lot of platforms it is easier to code to standards (if they are consistently implemented across browsers) then specific platforms. Theoretically at least..