Why does Windows 10 abandon IE?

Windows 10 except for free, the biggest change is that Microsoft abandoned IE. Why is this?

Why should I abandon IE browser? Microsoft said that Spartan in Windows 10 uses a new rendering engine, and IE in the new system will also be adopted. The reason why IE is not fully proposed in the new system is mainly For compatibility purposes.

The past IE rendering engine, MSHTML.dll or Trident, will still be available, but only for sites that rely on IE's non-standard behavior, so that errors on these sites can be displayed correctly.

In addition, Microsoft also stressed that the IE browser's Trident engine has too many obstacles to new technologies, which also makes it necessary to ensure compatibility with past non-standard code, but also to meet the new open network standards. Under the regulations, there will only be more and more bugs.

Windows 10 new browser Spartan does not use the open source engine WebKit, but Microsoft has written from scratch, and the new engine is not a one-time update, it will continue to improve with the upgrade of the new system. And improvement.