I know a lot of WordPress developers who use Vue and love it. It’s different from the other options in that it scales down as well as it scales up. You can drop it in and start coding like jQuery, or use it to build a complex single-page applications or server-side rendered apps.
That seems very much in the WordPress philosophy to me. You can start a WordPress site without having to do much coding, then you can add in plugins, then configure those plugins, then build your own plugins and templates, etc. WordPress scales with their skills and Vue offers a similar learning path.
That said, no one knows the needs of WordPress like the WordPress team - there are always considerations outsiders like me aren’t aware of. So no matter what happens, I trust that they’ll have weighed all the options and made the best decision for their community.