You should really try working for a business that needs to actually, you know, turn a profit instead of upgrading to every shiny new system as they come out.
I'm surprised how many articles and comments completely disregard cost as an aspect here?
Cost of upgrading browsers on machines, upgrading images of base installs, etc.
A restrictive piece of software isn't always the issue for upgrading, especially web applications.
Fix the website and the changes are deployed to the whole enterprise.
For large LARGE companies, upgrading the browser can incur a huge cost.
Take GM for example. At a single given automotive plant, they may have 1,000 PCs.
Multiply that by every plant GM owns across the world, and then add in probably a few hundred thousand more for all of the PCs at the tech center and everywhere else and you're probably looking at upgrading browsers on a million boxes.
Most of these places are not set up with remote network installs for every location so you probably can't even automate the whole thing, and that means you have to have a warm body to go around and upgrade every single box.
The cost might be worth it in the end, but the task seems pretty daunting when the alternative is to do nothing and not lose any money.
Honestly I was at an automotive plant back in '99 and they still had somebody in the remote corner of the plant running Windows 3.1 on a token ring network.