Internal apps are a particular thing where 'good enough' is what you pretty much want most of the time. I would expect something with server-side rendering, admin scaffolding, data-driven views, and customizable templating.
I'm pretty sure you can mix-and-match to get all these things but it would be great to have one opinionated framework that takes the guesswork out of it and has google/stackoverflow-able how-tos.
I know JSF might sound dated but it is actually thriving, with rich component libraries like Primefaces. See the latest:
https://link.springer.com/book/10.1007/978-1-4842-7310-4
And check Primefaces: http://primefaces.org/showcase/index.xhtml