Some of the lower tier (but very common) LAN network hardware requires old versions of IE to function during firmware upgrades and configuration changes with no CLI equivalent options.

In most cases the hardware vendors never address the browser compatibility issue (due to focus on new products) and only provide a warning sign upon login. Likewise the hardware isn't easy to replace in some environments.

This use case is completely absent from the web browsing traffic usage patterns on the internet which predominate in browser usage statistics.