I agree that for many use cases, IE11 featureset is fine. We jump on the SPA ship too often. I think that static content and server-side rendered apps are often the best option that is for some reason considered out-of-fashion.

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.