One problem is that as a vendor, we have to work to the lowest common denominator. It's still generally a requirement that you support IE6, despite the department of health encouraging hospitals to upgrade, because they have legacy apps where the vendor has disappeared or the upgrade is too expensive / painful for the hospital to bear.

We actually ship customers a custom build of Chromium which can only access our application (hospital policy generally dictates they must use IE to access the internet for "security" reasons) - we would love them to just use modern browsers so we can ditch our custom client but it doesn't look like it's going to happen any time soon :-(