It isn't good or bad. It's an optional feature. No one is forced to use it unless they specifically want it.

Your bosses aren't forced to use it. This means that if they don't want to use them and they don't believe the official style guide has to impose them, you don't have to use them.

If your bosses decide to impose them and change teh official style guide to require type annotation then your personal taste doesn't have any say in the subject either way, and you only need to act like a professional and be a team player.

But the key issue is that no one is forced to use optional features unless they really want to.