Someone already did that - Advanced Trade API - Add currencies endpoints, max_precision for wallets responses.
But I don’t get why we should post missing things in feedback section! From https://forums.coinbasecloud.dev/t/important-update-for-coinbase-pro-api-users/904:
Coinbase Pro APIs continue to be available for set up and trading for those clients still using Coinbase Pro. We will not sunset Pro APIs until we have an equivalent REST and WebSocket API for advanced trading publicly available on Coinbase.
You told that Coinbase Pro APIs will be available until equivalent APIs will available for advanced trading!