Content translation has been used by the Catalan Wikipedia community to create more than 30,000 articles which seems to indicate that the tool is useful for those that enabled the beta feature. It seems reasonable to expose the tool to more users in the future by making it available by default to logged-in users.
Before we provide access to the tool by default, we want to identify which are the main blockers based on community feedback. We'll keep working on improving the tool in many different areas, but it is important for us to identify when the community considers the tool ready to get more exposure. So feel free to suggest key issues you anticipate a negative impact for if the tool was made available in the current state.