Security is another aspect. Any feature that involves user data needs to handle it securely. If the feature requires user login, then encryption and secure authentication methods are essential.
Monetization could be a consideration too. Do they want the feature to generate revenue? For example, a premium feature for advanced reviews or a subscription-based movie library.
Since they mentioned a "movie website," perhaps they're missing some core functionalities. Let me think: typical movie sites have movie listings, showtimes, cast information, reviews, ratings, trailers, and similar movies. Maybe they want to add something like a personalized movie list, a forum for discussions, or a way to track watched movies.
They might also want to know about design aspects. Should the feature have a user interface designed, or do they just need the functionality backend? Do they have any UI/UX guidelines that need to be followed?
I should also consider technical feasibility. Some features are easier to implement than others. A simple feature like a search bar is straightforward, but a recommendation system with machine learning would be more involved. The user might not have mentioned resources or time constraints, so it's important to suggest something that's both useful and achievable.