Because Microsoft is a big company you can’t always assume that someone is speaking ‘officially’.
Author Bio: Chris Jackson is a Principal Program Manager in the Experiences and Devices Group specializing in cybersecurity, application compatibility, and modernizing software assets.
You see, Internet Explorer is a compatibility solution. We’re not supporting new web standards for it and, while many sites work fine, developers by and large just aren’t testing for Internet Explorer these days. They’re testing on modern browsers. So, if we continued our previous approach, you would end up in a scenario where, by optimizing for the things you have, you end up not being able to use new apps as they come out. As new apps are coming out with greater frequency, what we want to help you do is avoid having to miss out on a progressively larger portion of the web!
Just in case you need proof to convince your manager to allocating budget to migrating to a modern browser. Lots of people are incapable of taking the time to understand why.
The perils of using Internet Explorer as your default browser – Microsoft Tech Community – 331732 : https://techcommunity.microsoft.com/t5/Windows-IT-Pro-Blog/The-perils-of-using-Internet-Explorer-as-your-default-browser/ba-p/331732