[dragontamer]

Edge is a glorification of the latest and greatest Windows 10 features: such as handwriting support and pen-note taking.

These features don't exist in Windows 7. The Windows 10 Win32 API (yes, its still getting updated) has much cleaner and better support for handwriting features on websites.

The other browsers are cross platform because they're mouse and keyboard based. Modern Windows 10 design is evolving more and more towards the active digitizer stylus however.

I dare you to find a browser as well suited to Pen / Stylus as Microsoft Edge is. Heck, I'm 100% certain that Microsoft Edge is the only "good" Stylus-based browser.