Vue.js roadmap and backward compatibility

We are working in an environment where the overall web application is maintained by a core team, but developers internal and external use the frameworks and tool to develop on the application. If the frameworks used are not backward compatible, overtime it will be impossible to upgrade the systems as other developers used frameworks to develop (old versions for example).

We would like to choose a modern JS framework, thinking a bit more serious about Vue.js. Can anyone share thoughts about Vue.js roadmap and upgradability of the framework as it goes to V3, V4, etc?

Is the core team's mission to keep it the new versions backward compatible? not to break any APIs offered in the previous versions, etc?