Hey, another core team member. You certainly can use whatever client you want with the Redwood API - you just might not get all the bells and whistles that are built into our web side!
The GraphQL api in Redwood is powerful, yet simple - so you would build your backend in Redwood, and have your angular front end make gql queries like you would with any other backend.
Hi! Core team member here, right now we have our hands a little full with the launch week, but will be moving onto v2 very soon!
Best way to get more info is to create a post on the forums, or an issue! The discord contributing channel is a great place too. All the links on the main website https://redwoodjs.com
The GraphQL api in Redwood is powerful, yet simple - so you would build your backend in Redwood, and have your angular front end make gql queries like you would with any other backend.