Transitioning to (WebSocket)GraphQL Subscription-Based Data Management in React Native

Question

I am developing a React Native App where I use GraphQL queries for GET calls, Axios for POST calls, GraphQL Subscriptions for real-time updates.

I also have an offline save feature that stores data locally (SqlLite). When device reconnects, I trigger a POST call to save drafts, a GET call to get latest data and then, enable subscriptions.

I am wondering if I can unify the whole process by switching all POST, GET calls in React Native app to Subscriptions (Websocket).

My concerns are

• Handling success/error responses (which is straightforward with Axios/GraphQL & potentially bit complex with subscriptions)
• Significant time investment required for this transition.

Questions

1. Is it beneficial to make this switch?
2. Are there any challenges associated with transferring large volume of data via subscription protocol, particularly through WebSocket technology?