You can't have evolution without dropping ties to the past from time to time. That's about time to drop IE11 to take full advantage of modern Web features.
However, for those who see a Web browser as an application runtime, IE11 should be out of question. Vue is an application framework, and as such, it should benefit from all the improvements in the Web platform implemented in the modern Web browsers.
IE11 is frozen in time. and won't support any newer tech, think about web components, HTTP 3 etc.