I'm an intern at a startup that up to this point had all of their software build at an external company in a low cost country. Even though the development of their product started not too long ago (max 1 year ago) their stack contains AngularJS on the front end.
Since I only know React and Vue from a framework perspective I started to look into it and discovered that AngularJS is basically v1. At the time of this writing AngularJS is in long time support and will stop being maintained altogether. This software is not in production yet and although I get that you can't always work with the latest technologies, I really have the feeling that the company shouldn't use AngularJS. Unfortunately I am in the half intern half CTO position where I know the most from a developer perspective but yet am still an intern and acknowledge my lack of industry experience. (only had a full stack job for about a year).
However I do face the decision of just completing the development or informing the company about the stack.