Just asking why the had vue at one time but didn’t add the video app for PlayStation video to replace vue with like all the other movie apps out there
Roku doesn't build the apps (mostly). Sony built the PlayStation Vue app. And, when Sony shuttered the service, they app went away. As for why it wasn't replaced with a different app, it would be up to Sony to build an app (as they did for PlayStation Vue).
DBDukes Roku Community Streaming Expert Note: I am not a Roku employee.
If this post solves your problem please help others find this answer and click "Accept as Solution."